一部のパッケージの「dpkg -l」出力でAMD64は何ですか？他のパッケージではありませんか？
以下は、私のUbuntuシステムでの_dpkg -l_コマンドの出力です。
_Desired=Unknown/Install/Remove/Purge/Hold
| Status=Not/Inst/Conf-files/Unpacked/halF-conf/Half-inst/trig-aWait/Trig-pend
|/ Err?=(none)/Reinst-required (Status,Err: uppercase=bad)
||/ Name Version Architecture Description
+++-===============================-==========================================-============-===============================================================================
ii adduser 3.113+nmu3ubuntu3 all add and remove users and groups
ii apt 1.0.1ubuntu2.19 AMD64 commandline package manager
ii apt-utils 1.0.1ubuntu2.19 AMD64 package management related utility programs
ii base-files 7.2ubuntu5.5 AMD64 Debian base system miscellaneous files
ii base-passwd 3.5.33 AMD64 Debian base system master password and group files
ii bash 4.3-7ubuntu1.7 AMD64 GNU Bourne Again Shell
ii bsdutils 1:2.20.1-5.1ubuntu20.9 AMD64 Basic utilities from 4.4BSD-Lite
ii busybox-initramfs 1:1.21.0-1ubuntu1 AMD64 Standalone Shell setup for initramfs
ii bzip2 1.0.6-5 AMD64 high-quality block-sorting file compressor - utilities
ii console-setup 1.70ubuntu8 all console font and keymap setup program
ii coreutils 8.21-1ubuntu5.4 AMD64 GNU core utilities
ii cpio 2.11+dfsg-1ubuntu1.2 AMD64 GNU cpio -- a program to manage archives of files
ii cron 3.0pl1-124ubuntu2 AMD64 process scheduling daemon
ii dash 0.5.7-4ubuntu1 AMD64 POSIX-compliant Shell
ii debconf 1.5.51ubuntu2 all Debian configuration management system
ii debconf-i18n 1.5.51ubuntu2 all full internationalization support for debconf
ii debianutils 4.4 AMD64 Miscellaneous utilities specific to Debian
ii dh-python 1.20140128-1ubuntu8.2 all Debian helper tools for packaging Python libraries and applications
ii diffutils 1:3.3-1 AMD64 File comparison utilities
ii dmsetup 2:1.02.77-6ubuntu2 AMD64 Linux Kernel Device Mapper userspace library
ii dpkg 1.17.5ubuntu5.8 AMD64 Debian package management system
ii e2fslibs:AMD64 1.42.9-3ubuntu1.3 AMD64 ext2/ext3/ext4 file system libraries
ii e2fsprogs 1.42.9-3ubuntu1.3 AMD64 ext2/ext3/ext4 file system utilities
ii eject 2.1.5+deb1+cvs20081104-13.1ubuntu0.14.04.1 AMD64 ejects CDs and operates CD-Changers under Linux
ii file 1:5.14-2ubuntu3.4 AMD64 Determines file type using "magic" numbers
ii findutils 4.4.2-7 AMD64 utilities for finding files--find, xargs
ii gcc-4.8-base:AMD64 4.8.4-2ubuntu1~14.04.4 AMD64 GCC, the GNU Compiler Collection (base package)
ii gcc-4.9-base:AMD64 4.9.3-0ubuntu4 AMD64 GCC, the GNU Compiler Collection (base package)
_一部のパッケージ名の最後にある_:AMD64_の意味は何ですか（つまり、_e2fslibs:AMD64_または_gcc-4.8-base:AMD64_）？すべてのパッケージでアーキテクチャが指定されていないのはなぜですか？
名前の一部に:AMD64を含むアプリ、つまりzlib1g:AMD64も、何も失うことなく:i386の対応物をインストールでき、システム上で共存できます。名前で指定されていないもの、つまりxwaylandは、AMD64バージョンを削除し、i386バージョンがインストールされている場合はそれをインストールします。逆も同様です。アーキテクチャ列にallが付いているアプリは、アプリがi386とAMD64の両方と互換性があり、対応するものをインストールする必要がないことを意味します。
例：
$ dpkg -l
ii xwayland 2:1.19.6-1ub AMD64 Xwayland X server
ii xxd 2:8.0.1453-1 AMD64 tool to make (or reverse) a hex d
ii xz-utils 5.2.2-1.3 AMD64 XZ-format compression utilities
ii xzoom 0.3-24build1 AMD64 magnify part of X display, with r
ii yasm 1.3.0-2build AMD64 modular assembler with multiple s
ii Yelp 3.26.0-1ubun AMD64 Help browser for GNOME
ii Yelp-xsl 3.20.1-4 all XSL stylesheets for the Yelp help
ii zenity 3.28.1-1 AMD64 Display graphical dialog boxes fr
ii zenity-common 3.28.1-1 all Display graphical dialog boxes fr
ii Zip 3.0-11build1 AMD64 Archiver for .Zip files
ii zlib1g:AMD64 1:1.2.11.dfs AMD64 compression library - runtime
ii zlib1g:i386 1:1.2.11.dfs i386 compression library - runtime
ii zlib1g-dev:AMD 1:1.2.11.dfs AMD64 compression library - development
$ Sudo apt install xwayland:i386
Reading package lists... Done
Building dependency tree
Reading state information... Done
The following additional packages will be installed:
libaudit1:i386 libbz2-1.0:i386 libcap-ng0:i386 libepoxy0:i386
libfontenc1:i386 libxfont2:i386
The following packages will be REMOVED:
ubuntu-session xwayland
The following NEW packages will be installed:
libaudit1:i386 libbz2-1.0:i386 libcap-ng0:i386 libepoxy0:i386
libfontenc1:i386 libxfont2:i386 xwayland:i386
0 upgraded, 7 newly installed, 2 to remove and 31 not upgraded.
Need to get 1,291 kB of archives.
After this operation, 1,799 kB of additional disk space will be used.
Do you want to continue? [Y/n] ^C
$ Sudo apt install zlib1g-dev:i386
Reading package lists... Done
Building dependency tree
Reading state information... Done
The following additional packages will be installed:
libc6-dev:i386 linux-libc-dev:i386
Suggested packages:
glibc-doc:i386
The following NEW packages will be installed:
libc6-dev:i386 linux-libc-dev:i386 zlib1g-dev:i386
0 upgraded, 3 newly installed, 0 to remove and 31 not upgraded.
Need to get 3,435 kB of archives.
After this operation, 19.8 MB of additional disk space will be used.
Do you want to continue? [Y/n] ^C
お役に立てれば！