debian apt updateはDVDを許可しません
髪の毛を抜いていきます。私はdebian 9システムなしインターネットアクセスを持っていて、適切な更新を試みます。しかし、常に同じエラーメッセージが表示されます（以下を参照）。安全でないリポジトリを許可するためにいくつかのオプションを試しましたが、何も機能しないようです。どんな助けにも感謝します。
# apt update
Ign:1 cdrom://[Debian GNU/Linux 9.5.0 _Stretch_ - Official AMD64 DVD Binary-1 20180714-10:25] stretch InRelease
Err:2 cdrom://[Debian GNU/Linux 9.5.0 _Stretch_ - Official AMD64 DVD Binary-1 20180714-10:25] stretch Release
Please use apt-cdrom to make this CD-ROM recognized by APT. apt-get update cannot be used to add new CD-ROMs
Reading package lists... Done
E: The repository 'cdrom://[Debian GNU/Linux 9.5.0 _Stretch_ - Official AMD64 DVD Binary-1 20180714-10:25] stretch Release' does not have a Release file.
N: Updating from such a repository can't be done securely, and is therefore disabled by default.
N: See apt-secure(8) manpage for repository creation and user configuration details.
Sources.listの内容：
# cat /etc/apt/sources.list
deb cdrom:[Debian GNU/Linux 9.5.0 _Stretch_ - Official AMD64 DVD Binary-1 20180714-10:25]/ stretch contrib main
これが私のapt-configです。多分、これに少し光を当てることができます。
# apt-config dump
APT "";
APT::Architecture "AMD64";
APT::Build-Essential "";
APT::Build-Essential:: "build-essential";
APT::Install-Recommends "1";
APT::Install-Suggests "0";
APT::Sandbox "";
APT::Sandbox::User "_apt";
APT::Authentication "";
APT::Authentication::TrustCDROM "true";
APT::NeverAutoRemove "";
APT::NeverAutoRemove:: "^firmware-linux.*";
APT::NeverAutoRemove:: "^linux-firmware$";
APT::NeverAutoRemove:: "^linux-image-3\.16\.0-4-AMD64$";
APT::NeverAutoRemove:: "^linux-image-4\.9\.0-4-AMD64$";
APT::NeverAutoRemove:: "^linux-headers-3\.16\.0-4-AMD64$";
APT::NeverAutoRemove:: "^linux-headers-4\.9\.0-4-AMD64$";
APT::NeverAutoRemove:: "^linux-image-extra-3\.16\.0-4-AMD64$";
APT::NeverAutoRemove:: "^linux-image-extra-4\.9\.0-4-AMD64$";
APT::NeverAutoRemove:: "^linux-signed-image-3\.16\.0-4-AMD64$";
APT::NeverAutoRemove:: "^linux-signed-image-4\.9\.0-4-AMD64$";
APT::NeverAutoRemove:: "^kfreebsd-image-3\.16\.0-4-AMD64$";
APT::NeverAutoRemove:: "^kfreebsd-image-4\.9\.0-4-AMD64$";
APT::NeverAutoRemove:: "^kfreebsd-headers-3\.16\.0-4-AMD64$";
APT::NeverAutoRemove:: "^kfreebsd-headers-4\.9\.0-4-AMD64$";
APT::NeverAutoRemove:: "^gnumach-image-3\.16\.0-4-AMD64$";
APT::NeverAutoRemove:: "^gnumach-image-4\.9\.0-4-AMD64$";
APT::NeverAutoRemove:: "^.*-modules-3\.16\.0-4-AMD64$";
APT::NeverAutoRemove:: "^.*-modules-4\.9\.0-4-AMD64$";
APT::NeverAutoRemove:: "^.*-kernel-3\.16\.0-4-AMD64$";
APT::NeverAutoRemove:: "^.*-kernel-4\.9\.0-4-AMD64$";
APT::NeverAutoRemove:: "^linux-backports-modules-.*-3\.16\.0-4-AMD64$";
APT::NeverAutoRemove:: "^linux-backports-modules-.*-4\.9\.0-4-AMD64$";
APT::NeverAutoRemove:: "^linux-tools-3\.16\.0-4-AMD64$";
APT::NeverAutoRemove:: "^linux-tools-4\.9\.0-4-AMD64$";
APT::VersionedKernelPackages "";
APT::VersionedKernelPackages:: "linux-image";
APT::VersionedKernelPackages:: "linux-headers";
APT::VersionedKernelPackages:: "linux-image-extra";
APT::VersionedKernelPackages:: "linux-signed-image";
APT::VersionedKernelPackages:: "kfreebsd-image";
APT::VersionedKernelPackages:: "kfreebsd-headers";
APT::VersionedKernelPackages:: "gnumach-image";
APT::VersionedKernelPackages:: ".*-modules";
APT::VersionedKernelPackages:: ".*-kernel";
APT::VersionedKernelPackages:: "linux-backports-modules-.*";
APT::VersionedKernelPackages:: "linux-tools";
APT::Never-MarkAuto-Sections "";
APT::Never-MarkAuto-Sections:: "metapackages";
APT::Never-MarkAuto-Sections:: "contrib/metapackages";
APT::Never-MarkAuto-Sections:: "non-free/metapackages";
APT::Never-MarkAuto-Sections:: "restricted/metapackages";
APT::Never-MarkAuto-Sections:: "universe/metapackages";
APT::Never-MarkAuto-Sections:: "multiverse/metapackages";
APT::Move-Autobit-Sections "";
APT::Move-Autobit-Sections:: "oldlibs";
APT::Move-Autobit-Sections:: "contrib/oldlibs";
APT::Move-Autobit-Sections:: "non-free/oldlibs";
APT::Move-Autobit-Sections:: "restricted/oldlibs";
APT::Move-Autobit-Sections:: "universe/oldlibs";
APT::Move-Autobit-Sections:: "multiverse/oldlibs";
APT::Architectures "";
APT::Architectures:: "AMD64";
APT::Architectures:: "i386";
APT::Compressor "";
APT::Compressor::. "";
APT::Compressor::.::Name ".";
APT::Compressor::.::Extension "";
APT::Compressor::.::Binary "";
APT::Compressor::.::Cost "0";
APT::Compressor::lz4 "";
APT::Compressor::lz4::Name "lz4";
APT::Compressor::lz4::Extension ".lz4";
APT::Compressor::lz4::Binary "false";
APT::Compressor::lz4::Cost "50";
APT::Compressor::gzip "";
APT::Compressor::gzip::Name "gzip";
APT::Compressor::gzip::Extension ".gz";
APT::Compressor::gzip::Binary "gzip";
APT::Compressor::gzip::Cost "100";
APT::Compressor::gzip::CompressArg "";
APT::Compressor::gzip::CompressArg:: "-6n";
APT::Compressor::gzip::UncompressArg "";
APT::Compressor::gzip::UncompressArg:: "-d";
APT::Compressor::xz "";
APT::Compressor::xz::Name "xz";
APT::Compressor::xz::Extension ".xz";
APT::Compressor::xz::Binary "xz";
APT::Compressor::xz::Cost "200";
APT::Compressor::xz::CompressArg "";
APT::Compressor::xz::CompressArg:: "-6";
APT::Compressor::xz::UncompressArg "";
APT::Compressor::xz::UncompressArg:: "-d";
APT::Compressor::bzip2 "";
APT::Compressor::bzip2::Name "bzip2";
APT::Compressor::bzip2::Extension ".bz2";
APT::Compressor::bzip2::Binary "bzip2";
APT::Compressor::bzip2::Cost "300";
APT::Compressor::bzip2::CompressArg "";
APT::Compressor::bzip2::CompressArg:: "-6";
APT::Compressor::bzip2::UncompressArg "";
APT::Compressor::bzip2::UncompressArg:: "-d";
APT::Compressor::lzma "";
APT::Compressor::lzma::Name "lzma";
APT::Compressor::lzma::Extension ".lzma";
APT::Compressor::lzma::Binary "xz";
APT::Compressor::lzma::Cost "400";
APT::Compressor::lzma::CompressArg "";
APT::Compressor::lzma::CompressArg:: "--format=lzma";
APT::Compressor::lzma::CompressArg:: "-6";
APT::Compressor::lzma::UncompressArg "";
APT::Compressor::lzma::UncompressArg:: "--format=lzma";
APT::Compressor::lzma::UncompressArg:: "-d";
Dir "/";
Dir::State "var/lib/apt";
Dir::State::lists "lists/";
Dir::State::cdroms "cdroms.list";
Dir::State::mirrors "mirrors/";
Dir::State::extended_states "extended_states";
Dir::State::status "/var/lib/dpkg/status";
Dir::Cache "var/cache/apt";
Dir::Cache::archives "archives/";
Dir::Cache::srcpkgcache "srcpkgcache.bin";
Dir::Cache::pkgcache "pkgcache.bin";
Dir::Etc "etc/apt";
Dir::Etc::sourcelist "sources.list";
Dir::Etc::sourceparts "sources.list.d";
Dir::Etc::main "apt.conf";
Dir::Etc::netrc "auth.conf";
Dir::Etc::parts "apt.conf.d";
Dir::Etc::preferences "preferences";
Dir::Etc::preferencesparts "preferences.d";
Dir::Etc::trusted "trusted.gpg";
Dir::Etc::trustedparts "trusted.gpg.d";
Dir::Bin "";
Dir::Bin::methods "/usr/lib/apt/methods";
Dir::Bin::solvers "";
Dir::Bin::solvers:: "/usr/lib/apt/solvers";
Dir::Bin::planners "";
Dir::Bin::planners:: "/usr/lib/apt/planners";
Dir::Bin::dpkg "/usr/bin/dpkg";
Dir::Bin::gzip "/bin/gzip";
Dir::Bin::bzip2 "/bin/bzip2";
Dir::Bin::xz "/usr/bin/xz";
Dir::Bin::lz4 "/usr/bin/lz4";
Dir::Bin::lzma "/usr/bin/xz";
Dir::Media "";
Dir::Media::MountPath "/media/cdrom";
Dir::Log "var/log/apt";
Dir::Log::Terminal "term.log";
Dir::Log::History "history.log";
Dir::Log::Planner "eipp.log.xz";
Dir::Ignore-Files-Silently "";
Dir::Ignore-Files-Silently:: "~$";
Dir::Ignore-Files-Silently:: "\.disabled$";
Dir::Ignore-Files-Silently:: "\.bak$";
Dir::Ignore-Files-Silently:: "\.dpkg-[a-z]+$";
Dir::Ignore-Files-Silently:: "\.ucf-[a-z]+$";
Dir::Ignore-Files-Silently:: "\.save$";
Dir::Ignore-Files-Silently:: "\.orig$";
Dir::Ignore-Files-Silently:: "\.distUpgrade$";
Acquire "";
Acquire::AllowInsecureRepositories "0";
Acquire::AllowWeakRepositories "0";
Acquire::AllowDowngradeToInsecureRepositories "0";
Acquire::cdrom "";
Acquire::cdrom::mount "/media/cdrom";
Acquire::IndexTargets "";
Acquire::IndexTargets::deb "";
Acquire::IndexTargets::deb::Packages "";
Acquire::IndexTargets::deb::Packages::MetaKey "$(COMPONENT)/binary-$(ARCHITECTURE)/Packages";
Acquire::IndexTargets::deb::Packages::flatMetaKey "Packages";
Acquire::IndexTargets::deb::Packages::ShortDescription "Packages";
Acquire::IndexTargets::deb::Packages::Description "$(RELEASE)/$(COMPONENT) $(ARCHITECTURE) Packages";
Acquire::IndexTargets::deb::Packages::flatDescription "$(RELEASE) Packages";
Acquire::IndexTargets::deb::Packages::Optional "0";
Acquire::IndexTargets::deb::Translations "";
Acquire::IndexTargets::deb::Translations::MetaKey "$(COMPONENT)/i18n/Translation-$(LANGUAGE)";
Acquire::IndexTargets::deb::Translations::flatMetaKey "$(LANGUAGE)";
Acquire::IndexTargets::deb::Translations::ShortDescription "Translation-$(LANGUAGE)";
Acquire::IndexTargets::deb::Translations::Description "$(RELEASE)/$(COMPONENT) Translation-$(LANGUAGE)";
Acquire::IndexTargets::deb::Translations::flatDescription "$(RELEASE) Translation-$(LANGUAGE)";
Acquire::IndexTargets::deb-src "";
Acquire::IndexTargets::deb-src::Sources "";
Acquire::IndexTargets::deb-src::Sources::MetaKey "$(COMPONENT)/source/Sources";
Acquire::IndexTargets::deb-src::Sources::flatMetaKey "Sources";
Acquire::IndexTargets::deb-src::Sources::ShortDescription "Sources";
Acquire::IndexTargets::deb-src::Sources::Description "$(RELEASE)/$(COMPONENT) Sources";
Acquire::IndexTargets::deb-src::Sources::flatDescription "$(RELEASE) Sources";
Acquire::IndexTargets::deb-src::Sources::Optional "0";
Acquire::Changelogs "";
Acquire::Changelogs::URI "";
Acquire::Changelogs::URI::Origin "";
Acquire::Changelogs::URI::Origin::Debian "http://metadata.ftp-master.debian.org/changelogs/@CHANGEPATH@_changelog";
Acquire::Changelogs::URI::Origin::Tanglu "http://metadata.tanglu.org/changelogs/@CHANGEPATH@_changelog";
Acquire::Changelogs::URI::Origin::Ubuntu "http://changelogs.ubuntu.com/changelogs/pool/@CHANGEPATH@/changelog";
Acquire::Changelogs::URI::Origin::Ultimedia "http://packages.ultimediaos.com/changelogs/pool/@CHANGEPATH@/changelog.txt";
Acquire::Changelogs::AlwaysOnline "";
Acquire::Changelogs::AlwaysOnline::Origin "";
Acquire::Changelogs::AlwaysOnline::Origin::Ubuntu "1";
Acquire::Languages "";
Acquire::Languages:: "en_US";
Acquire::Languages:: "en";
Acquire::Languages:: "none";
Acquire::CompressionTypes "";
Acquire::CompressionTypes::xz "xz";
Acquire::CompressionTypes::bz2 "bzip2";
Acquire::CompressionTypes::lzma "lzma";
Acquire::CompressionTypes::gz "gzip";
Acquire::CompressionTypes::lz4 "lz4";
DPkg "";
DPkg::Pre-Install-Pkgs "";
DPkg::Pre-Install-Pkgs:: "/usr/bin/apt-listchanges --apt || test $? -lt 10";
DPkg::Pre-Install-Pkgs:: "/usr/sbin/dpkg-preconfigure --apt || true";
DPkg::Tools "";
DPkg::Tools::Options "";
DPkg::Tools::Options::/usr/bin/apt-listchanges "";
DPkg::Tools::Options::/usr/bin/apt-listchanges::Version "2";
DPkg::Tools::Options::/usr/bin/apt-listchanges::InfoFD "20";
Dpkg:Progress-Fancy "1";
Binary "apt-config";
Binary::apt "";
Binary::apt::APT "";
Binary::apt::APT::Color "1";
Binary::apt::APT::Cache "";
Binary::apt::APT::Cache::Show "";
Binary::apt::APT::Cache::Show::Version "2";
Binary::apt::APT::Cache::AllVersions "0";
Binary::apt::APT::Cache::ShowVirtuals "1";
Binary::apt::APT::Cache::Search "";
Binary::apt::APT::Cache::Search::Version "2";
Binary::apt::APT::Cache::ShowDependencyType "1";
Binary::apt::APT::Cache::ShowVersion "1";
Binary::apt::APT::Get "";
Binary::apt::APT::Get::Upgrade-Allow-New "1";
Binary::apt::APT::Cmd "";
Binary::apt::APT::Cmd::Show-Update-Stats "1";
Binary::apt::APT::Keep-Downloaded-Packages "0";
Binary::apt::DPkg "";
Binary::apt::DPkg::Progress-Fancy "1";
Binary::apt-get "";
Binary::apt-get::Acquire "";
Binary::apt-get::Acquire::AllowInsecureRepositories "1";
CommandLine "";
CommandLine::AsString "apt-config dump";
apt --allow-unauthenticated update
Ign:1 cdrom://[Debian GNU/Linux 9.5.0 _Stretch_ - Official AMD64 DVD Binary-1 20180714-10:25] stretch InRelease
Err:2 cdrom://[Debian GNU/Linux 9.5.0 _Stretch_ - Official AMD64 DVD Binary-1 20180714-10:25] stretch Release
Please use apt-cdrom to make this CD-ROM recognized by APT. apt-get update cannot be used to add new CD-ROMs
Reading package lists... Done
E: The repository 'cdrom://[Debian GNU/Linux 9.5.0 _Stretch_ - Official AMD64 DVD Binary-1 20180714-10:25] stretch Release' does not have a Release file.
N: Updating from such a repository can't be done securely, and is therefore disabled by default.
N: See apt-secure(8) manpage for repository creation and user configuration details.
apt-get --allow-unauthenticated update
Ign:1 cdrom://[Debian GNU/Linux 9.5.0 _Stretch_ - Official AMD64 DVD Binary-1 20180714-10:25] stretch InRelease
Ign:2 cdrom://[Debian GNU/Linux 9.5.0 _Stretch_ - Official AMD64 DVD Binary-1 20180714-10:25] stretch Release
Ign:3 cdrom://[Debian GNU/Linux 9.5.0 _Stretch_ - Official AMD64 DVD Binary-1 20180714-10:25] stretch/contrib i386 Packages
Ign:4 cdrom://[Debian GNU/Linux 9.5.0 _Stretch_ - Official AMD64 DVD Binary-1 20180714-10:25] stretch/contrib AMD64 Packages
Ign:5 cdrom://[Debian GNU/Linux 9.5.0 _Stretch_ - Official AMD64 DVD Binary-1 20180714-10:25] stretch/contrib all Packages
Ign:6 cdrom://[Debian GNU/Linux 9.5.0 _Stretch_ - Official AMD64 DVD Binary-1 20180714-10:25] stretch/contrib Translation-en
Ign:7 cdrom://[Debian GNU/Linux 9.5.0 _Stretch_ - Official AMD64 DVD Binary-1 20180714-10:25] stretch/contrib Translation-en_US
Ign:8 cdrom://[Debian GNU/Linux 9.5.0 _Stretch_ - Official AMD64 DVD Binary-1 20180714-10:25] stretch/main i386 Packages
Ign:9 cdrom://[Debian GNU/Linux 9.5.0 _Stretch_ - Official AMD64 DVD Binary-1 20180714-10:25] stretch/main all Packages
Ign:10 cdrom://[Debian GNU/Linux 9.5.0 _Stretch_ - Official AMD64 DVD Binary-1 20180714-10:25] stretch/main AMD64 Packages
Ign:11 cdrom://[Debian GNU/Linux 9.5.0 _Stretch_ - Official AMD64 DVD Binary-1 20180714-10:25] stretch/main Translation-en_US
Ign:12 cdrom://[Debian GNU/Linux 9.5.0 _Stretch_ - Official AMD64 DVD Binary-1 20180714-10:25] stretch/main Translation-en
Ign:3 cdrom://[Debian GNU/Linux 9.5.0 _Stretch_ - Official AMD64 DVD Binary-1 20180714-10:25] stretch/contrib i386 Packages
Ign:4 cdrom://[Debian GNU/Linux 9.5.0 _Stretch_ - Official AMD64 DVD Binary-1 20180714-10:25] stretch/contrib AMD64 Packages
Ign:5 cdrom://[Debian GNU/Linux 9.5.0 _Stretch_ - Official AMD64 DVD Binary-1 20180714-10:25] stretch/contrib all Packages
Ign:6 cdrom://[Debian GNU/Linux 9.5.0 _Stretch_ - Official AMD64 DVD Binary-1 20180714-10:25] stretch/contrib Translation-en
Ign:7 cdrom://[Debian GNU/Linux 9.5.0 _Stretch_ - Official AMD64 DVD Binary-1 20180714-10:25] stretch/contrib Translation-en_US
Ign:8 cdrom://[Debian GNU/Linux 9.5.0 _Stretch_ - Official AMD64 DVD Binary-1 20180714-10:25] stretch/main i386 Packages
Ign:9 cdrom://[Debian GNU/Linux 9.5.0 _Stretch_ - Official AMD64 DVD Binary-1 20180714-10:25] stretch/main all Packages
Ign:10 cdrom://[Debian GNU/Linux 9.5.0 _Stretch_ - Official AMD64 DVD Binary-1 20180714-10:25] stretch/main AMD64 Packages
Ign:11 cdrom://[Debian GNU/Linux 9.5.0 _Stretch_ - Official AMD64 DVD Binary-1 20180714-10:25] stretch/main Translation-en_US
Ign:12 cdrom://[Debian GNU/Linux 9.5.0 _Stretch_ - Official AMD64 DVD Binary-1 20180714-10:25] stretch/main Translation-en
Ign:3 cdrom://[Debian GNU/Linux 9.5.0 _Stretch_ - Official AMD64 DVD Binary-1 20180714-10:25] stretch/contrib i386 Packages
Ign:4 cdrom://[Debian GNU/Linux 9.5.0 _Stretch_ - Official AMD64 DVD Binary-1 20180714-10:25] stretch/contrib AMD64 Packages
Ign:5 cdrom://[Debian GNU/Linux 9.5.0 _Stretch_ - Official AMD64 DVD Binary-1 20180714-10:25] stretch/contrib all Packages
Ign:6 cdrom://[Debian GNU/Linux 9.5.0 _Stretch_ - Official AMD64 DVD Binary-1 20180714-10:25] stretch/contrib Translation-en
Ign:7 cdrom://[Debian GNU/Linux 9.5.0 _Stretch_ - Official AMD64 DVD Binary-1 20180714-10:25] stretch/contrib Translation-en_US
Ign:8 cdrom://[Debian GNU/Linux 9.5.0 _Stretch_ - Official AMD64 DVD Binary-1 20180714-10:25] stretch/main i386 Packages
Ign:9 cdrom://[Debian GNU/Linux 9.5.0 _Stretch_ - Official AMD64 DVD Binary-1 20180714-10:25] stretch/main all Packages
Ign:10 cdrom://[Debian GNU/Linux 9.5.0 _Stretch_ - Official AMD64 DVD Binary-1 20180714-10:25] stretch/main AMD64 Packages
Ign:11 cdrom://[Debian GNU/Linux 9.5.0 _Stretch_ - Official AMD64 DVD Binary-1 20180714-10:25] stretch/main Translation-en_US
Ign:12 cdrom://[Debian GNU/Linux 9.5.0 _Stretch_ - Official AMD64 DVD Binary-1 20180714-10:25] stretch/main Translation-en
Ign:3 cdrom://[Debian GNU/Linux 9.5.0 _Stretch_ - Official AMD64 DVD Binary-1 20180714-10:25] stretch/contrib i386 Packages
Ign:4 cdrom://[Debian GNU/Linux 9.5.0 _Stretch_ - Official AMD64 DVD Binary-1 20180714-10:25] stretch/contrib AMD64 Packages
Ign:5 cdrom://[Debian GNU/Linux 9.5.0 _Stretch_ - Official AMD64 DVD Binary-1 20180714-10:25] stretch/contrib all Packages
Ign:6 cdrom://[Debian GNU/Linux 9.5.0 _Stretch_ - Official AMD64 DVD Binary-1 20180714-10:25] stretch/contrib Translation-en
Ign:7 cdrom://[Debian GNU/Linux 9.5.0 _Stretch_ - Official AMD64 DVD Binary-1 20180714-10:25] stretch/contrib Translation-en_US
Ign:8 cdrom://[Debian GNU/Linux 9.5.0 _Stretch_ - Official AMD64 DVD Binary-1 20180714-10:25] stretch/main i386 Packages
Ign:9 cdrom://[Debian GNU/Linux 9.5.0 _Stretch_ - Official AMD64 DVD Binary-1 20180714-10:25] stretch/main all Packages
Ign:10 cdrom://[Debian GNU/Linux 9.5.0 _Stretch_ - Official AMD64 DVD Binary-1 20180714-10:25] stretch/main AMD64 Packages
Ign:11 cdrom://[Debian GNU/Linux 9.5.0 _Stretch_ - Official AMD64 DVD Binary-1 20180714-10:25] stretch/main Translation-en_US
Ign:12 cdrom://[Debian GNU/Linux 9.5.0 _Stretch_ - Official AMD64 DVD Binary-1 20180714-10:25] stretch/main Translation-en
Ign:3 cdrom://[Debian GNU/Linux 9.5.0 _Stretch_ - Official AMD64 DVD Binary-1 20180714-10:25] stretch/contrib i386 Packages
Ign:4 cdrom://[Debian GNU/Linux 9.5.0 _Stretch_ - Official AMD64 DVD Binary-1 20180714-10:25] stretch/contrib AMD64 Packages
Ign:5 cdrom://[Debian GNU/Linux 9.5.0 _Stretch_ - Official AMD64 DVD Binary-1 20180714-10:25] stretch/contrib all Packages
Ign:6 cdrom://[Debian GNU/Linux 9.5.0 _Stretch_ - Official AMD64 DVD Binary-1 20180714-10:25] stretch/contrib Translation-en
Ign:7 cdrom://[Debian GNU/Linux 9.5.0 _Stretch_ - Official AMD64 DVD Binary-1 20180714-10:25] stretch/contrib Translation-en_US
Ign:8 cdrom://[Debian GNU/Linux 9.5.0 _Stretch_ - Official AMD64 DVD Binary-1 20180714-10:25] stretch/main i386 Packages
Ign:9 cdrom://[Debian GNU/Linux 9.5.0 _Stretch_ - Official AMD64 DVD Binary-1 20180714-10:25] stretch/main all Packages
Ign:10 cdrom://[Debian GNU/Linux 9.5.0 _Stretch_ - Official AMD64 DVD Binary-1 20180714-10:25] stretch/main AMD64 Packages
Ign:11 cdrom://[Debian GNU/Linux 9.5.0 _Stretch_ - Official AMD64 DVD Binary-1 20180714-10:25] stretch/main Translation-en_US
Ign:12 cdrom://[Debian GNU/Linux 9.5.0 _Stretch_ - Official AMD64 DVD Binary-1 20180714-10:25] stretch/main Translation-en
Err:3 cdrom://[Debian GNU/Linux 9.5.0 _Stretch_ - Official AMD64 DVD Binary-1 20180714-10:25] stretch/contrib i386 Packages
Please use apt-cdrom to make this CD-ROM recognized by APT. apt-get update cannot be used to add new CD-ROMs
Ign:4 cdrom://[Debian GNU/Linux 9.5.0 _Stretch_ - Official AMD64 DVD Binary-1 20180714-10:25] stretch/contrib AMD64 Packages
Reading package lists... Done
W: The repository 'cdrom://[Debian GNU/Linux 9.5.0 _Stretch_ - Official AMD64 DVD Binary-1 20180714-10:25] stretch Release' does not have a Release file.
N: Data from such a repository can't be authenticated and is therefore potentially dangerous to use.
N: See apt-secure(8) manpage for repository creation and user configuration details.
E: Failed to fetch cdrom://[Debian GNU/Linux 9.5.0 _Stretch_ - Official AMD64 DVD Binary-1 20180714-10:25]/dists/stretch/contrib/binary-i386/Packages Please use apt-cdrom to make this CD-ROM recognized by APT. apt-get update cannot be used to add new CD-ROMs
E: Some index files failed to download. They have been ignored, or old ones used instead.
アップデート1
sources.listchangedを使用すると、apt updateの最後の出力が異なります。
sources.list
deb [ trusted=yes ] cdrom:[Debian GNU/Linux 9.5.0 _Stretch_ - Official AMD64 DVD Binary-1 20180714-10:25]/ stretch contrib main
適切な更新
Ign:1 cdrom://[Debian GNU/Linux 9.5.0 _Stretch_ - Official AMD64 DVD Binary-1 20180714-10:25] stretch InRelease
Ign:2 cdrom://[Debian GNU/Linux 9.5.0 _Stretch_ - Official AMD64 DVD Binary-1 20180714-10:25] stretch Release
Ign:3 cdrom://[Debian GNU/Linux 9.5.0 _Stretch_ - Official AMD64 DVD Binary-1 20180714-10:25] stretch/contrib AMD64 Packages
Ign:4 cdrom://[Debian GNU/Linux 9.5.0 _Stretch_ - Official AMD64 DVD Binary-1 20180714-10:25] stretch/contrib all Packages
Ign:5 cdrom://[Debian GNU/Linux 9.5.0 _Stretch_ - Official AMD64 DVD Binary-1 20180714-10:25] stretch/contrib i386 Packages
Ign:6 cdrom://[Debian GNU/Linux 9.5.0 _Stretch_ - Official AMD64 DVD Binary-1 20180714-10:25] stretch/contrib Translation-en
Ign:7 cdrom://[Debian GNU/Linux 9.5.0 _Stretch_ - Official AMD64 DVD Binary-1 20180714-10:25] stretch/contrib Translation-en_US
Ign:8 cdrom://[Debian GNU/Linux 9.5.0 _Stretch_ - Official AMD64 DVD Binary-1 20180714-10:25] stretch/main all Packages
Ign:9 cdrom://[Debian GNU/Linux 9.5.0 _Stretch_ - Official AMD64 DVD Binary-1 20180714-10:25] stretch/main i386 Packages
Ign:10 cdrom://[Debian GNU/Linux 9.5.0 _Stretch_ - Official AMD64 DVD Binary-1 20180714-10:25] stretch/main AMD64 Packages
Ign:11 cdrom://[Debian GNU/Linux 9.5.0 _Stretch_ - Official AMD64 DVD Binary-1 20180714-10:25] stretch/main Translation-en
Ign:12 cdrom://[Debian GNU/Linux 9.5.0 _Stretch_ - Official AMD64 DVD Binary-1 20180714-10:25] stretch/main Translation-en_US
Ign:3 cdrom://[Debian GNU/Linux 9.5.0 _Stretch_ - Official AMD64 DVD Binary-1 20180714-10:25] stretch/contrib AMD64 Packages
Ign:4 cdrom://[Debian GNU/Linux 9.5.0 _Stretch_ - Official AMD64 DVD Binary-1 20180714-10:25] stretch/contrib all Packages
Ign:5 cdrom://[Debian GNU/Linux 9.5.0 _Stretch_ - Official AMD64 DVD Binary-1 20180714-10:25] stretch/contrib i386 Packages
Ign:6 cdrom://[Debian GNU/Linux 9.5.0 _Stretch_ - Official AMD64 DVD Binary-1 20180714-10:25] stretch/contrib Translation-en
Ign:7 cdrom://[Debian GNU/Linux 9.5.0 _Stretch_ - Official AMD64 DVD Binary-1 20180714-10:25] stretch/contrib Translation-en_US
Ign:8 cdrom://[Debian GNU/Linux 9.5.0 _Stretch_ - Official AMD64 DVD Binary-1 20180714-10:25] stretch/main all Packages
Ign:9 cdrom://[Debian GNU/Linux 9.5.0 _Stretch_ - Official AMD64 DVD Binary-1 20180714-10:25] stretch/main i386 Packages
Ign:10 cdrom://[Debian GNU/Linux 9.5.0 _Stretch_ - Official AMD64 DVD Binary-1 20180714-10:25] stretch/main AMD64 Packages
Ign:11 cdrom://[Debian GNU/Linux 9.5.0 _Stretch_ - Official AMD64 DVD Binary-1 20180714-10:25] stretch/main Translation-en
Ign:12 cdrom://[Debian GNU/Linux 9.5.0 _Stretch_ - Official AMD64 DVD Binary-1 20180714-10:25] stretch/main Translation-en_US
Ign:3 cdrom://[Debian GNU/Linux 9.5.0 _Stretch_ - Official AMD64 DVD Binary-1 20180714-10:25] stretch/contrib AMD64 Packages
Ign:4 cdrom://[Debian GNU/Linux 9.5.0 _Stretch_ - Official AMD64 DVD Binary-1 20180714-10:25] stretch/contrib all Packages
Ign:5 cdrom://[Debian GNU/Linux 9.5.0 _Stretch_ - Official AMD64 DVD Binary-1 20180714-10:25] stretch/contrib i386 Packages
Ign:6 cdrom://[Debian GNU/Linux 9.5.0 _Stretch_ - Official AMD64 DVD Binary-1 20180714-10:25] stretch/contrib Translation-en
Ign:7 cdrom://[Debian GNU/Linux 9.5.0 _Stretch_ - Official AMD64 DVD Binary-1 20180714-10:25] stretch/contrib Translation-en_US
Ign:8 cdrom://[Debian GNU/Linux 9.5.0 _Stretch_ - Official AMD64 DVD Binary-1 20180714-10:25] stretch/main all Packages
Ign:9 cdrom://[Debian GNU/Linux 9.5.0 _Stretch_ - Official AMD64 DVD Binary-1 20180714-10:25] stretch/main i386 Packages
Ign:10 cdrom://[Debian GNU/Linux 9.5.0 _Stretch_ - Official AMD64 DVD Binary-1 20180714-10:25] stretch/main AMD64 Packages
Ign:11 cdrom://[Debian GNU/Linux 9.5.0 _Stretch_ - Official AMD64 DVD Binary-1 20180714-10:25] stretch/main Translation-en
Ign:12 cdrom://[Debian GNU/Linux 9.5.0 _Stretch_ - Official AMD64 DVD Binary-1 20180714-10:25] stretch/main Translation-en_US
Ign:3 cdrom://[Debian GNU/Linux 9.5.0 _Stretch_ - Official AMD64 DVD Binary-1 20180714-10:25] stretch/contrib AMD64 Packages
Ign:4 cdrom://[Debian GNU/Linux 9.5.0 _Stretch_ - Official AMD64 DVD Binary-1 20180714-10:25] stretch/contrib all Packages
Ign:5 cdrom://[Debian GNU/Linux 9.5.0 _Stretch_ - Official AMD64 DVD Binary-1 20180714-10:25] stretch/contrib i386 Packages
Ign:6 cdrom://[Debian GNU/Linux 9.5.0 _Stretch_ - Official AMD64 DVD Binary-1 20180714-10:25] stretch/contrib Translation-en
Ign:7 cdrom://[Debian GNU/Linux 9.5.0 _Stretch_ - Official AMD64 DVD Binary-1 20180714-10:25] stretch/contrib Translation-en_US
Ign:8 cdrom://[Debian GNU/Linux 9.5.0 _Stretch_ - Official AMD64 DVD Binary-1 20180714-10:25] stretch/main all Packages
Ign:9 cdrom://[Debian GNU/Linux 9.5.0 _Stretch_ - Official AMD64 DVD Binary-1 20180714-10:25] stretch/main i386 Packages
Ign:10 cdrom://[Debian GNU/Linux 9.5.0 _Stretch_ - Official AMD64 DVD Binary-1 20180714-10:25] stretch/main AMD64 Packages
Ign:11 cdrom://[Debian GNU/Linux 9.5.0 _Stretch_ - Official AMD64 DVD Binary-1 20180714-10:25] stretch/main Translation-en
Ign:12 cdrom://[Debian GNU/Linux 9.5.0 _Stretch_ - Official AMD64 DVD Binary-1 20180714-10:25] stretch/main Translation-en_US
Ign:3 cdrom://[Debian GNU/Linux 9.5.0 _Stretch_ - Official AMD64 DVD Binary-1 20180714-10:25] stretch/contrib AMD64 Packages
Ign:4 cdrom://[Debian GNU/Linux 9.5.0 _Stretch_ - Official AMD64 DVD Binary-1 20180714-10:25] stretch/contrib all Packages
Ign:5 cdrom://[Debian GNU/Linux 9.5.0 _Stretch_ - Official AMD64 DVD Binary-1 20180714-10:25] stretch/contrib i386 Packages
Ign:6 cdrom://[Debian GNU/Linux 9.5.0 _Stretch_ - Official AMD64 DVD Binary-1 20180714-10:25] stretch/contrib Translation-en
Ign:7 cdrom://[Debian GNU/Linux 9.5.0 _Stretch_ - Official AMD64 DVD Binary-1 20180714-10:25] stretch/contrib Translation-en_US
Ign:8 cdrom://[Debian GNU/Linux 9.5.0 _Stretch_ - Official AMD64 DVD Binary-1 20180714-10:25] stretch/main all Packages
Ign:9 cdrom://[Debian GNU/Linux 9.5.0 _Stretch_ - Official AMD64 DVD Binary-1 20180714-10:25] stretch/main i386 Packages
Ign:10 cdrom://[Debian GNU/Linux 9.5.0 _Stretch_ - Official AMD64 DVD Binary-1 20180714-10:25] stretch/main AMD64 Packages
Ign:11 cdrom://[Debian GNU/Linux 9.5.0 _Stretch_ - Official AMD64 DVD Binary-1 20180714-10:25] stretch/main Translation-en
Ign:12 cdrom://[Debian GNU/Linux 9.5.0 _Stretch_ - Official AMD64 DVD Binary-1 20180714-10:25] stretch/main Translation-en_US
Err:3 cdrom://[Debian GNU/Linux 9.5.0 _Stretch_ - Official AMD64 DVD Binary-1 20180714-10:25] stretch/contrib AMD64 Packages
Please use apt-cdrom to make this CD-ROM recognized by APT. apt-get update cannot be used to add new CD-ROMs
Ign:4 cdrom://[Debian GNU/Linux 9.5.0 _Stretch_ - Official AMD64 DVD Binary-1 20180714-10:25] stretch/contrib all Packages
Reading package lists... Done
E: Failed to fetch cdrom://[Debian GNU/Linux 9.5.0 _Stretch_ - Official AMD64 DVD Binary-1 20180714-10:25]/dists/stretch/contrib/binary-AMD64/Packages Please use apt-cdrom to make this CD-ROM recognized by APT. apt-get update cannot be used to add new CD-ROMs
E: Some index files failed to download. They have been ignored, or old ones used instead.
アップデート2
私はi386でmultiarchをセットアップしたことに気づきました。 dpkg --remove-architecture i386で削除しました。インストールされているi386パッケージはありませんでした。次に、sources.listからDVDを取り出し、apt-cdrom.を使用して再度追加しました。結果は同じままです。
質問とコメントで私が見たことから、あなたが間違って使用している唯一のものはtrustedオプションです。
きみの sources.listは1行スタイルの形式（ ドキュメント を参照）を使用しているため、cdromを信頼できるものにする正しいエントリは次のようになります。
deb [ trusted=yes ] cdrom:[Debian GNU/Linux 9.5.0 _Stretch_ - Official AMD64 DVD Binary-1 20180714-10:25]/ stretch contrib main
編集：リポジトリのセキュリティに関連する他のオプションがいくつかあります。
deb [ trusted=yes allow-insecure=yes allow-weak=yes allow-downgrade-to-insecure=yes ] cdrom:[Debian GNU/Linux 9.5.0 _Stretch_ - Official AMD64 DVD Binary-1 20180714-10:25]/ stretch contrib main