apt-get updateフェッチが非常に大きいのはなぜですか？
可能性のある複製：
apt-get更新リストのサイズが大きすぎます
clean12.04（リリース候補）をインストールし、今日までのすべての更新とアップグレードを受け入れた後、Sudo apt-get updateは常にMB内の情報を取得することがわかりました範囲は約12 MBですが、Sudo apt-get upgradeにはほとんどダウンロードするものがありません。
私が見る最大の3つのフェッチは次のとおりです。
http://archive.ubuntu.com precise/universe Sources [5,019 kB]
http://archive.ubuntu.com precise/main i386 Packages [1,274 KB]
http://archive.ubuntu.com precise/universe i386 Packages [4,796 KB]
Sudo apt-get updateのフェッチは11.10ではそれほど大きくなく、1 MBを超えることはめったにありませんでした。
私の質問はこれです。これらの大きなフェッチは、12.04が最近であるという理由だけですか、それともこれらの大きな更新が標準になりますか？
編集：マイクの答えに応じて、私はいくつかのスクリーンショットを投稿しています： 
2番目の編集：現在の/etc/apt/sources.listを含めます。これはafterです。以前「他のソフトウェア」イメージでチェックされていた「ソースコード」エントリのチェックを外しました。
# deb cdrom:[Ubuntu 12.04 LTS _Precise Pangolin_ - Beta i386 (20120421)]/ precise main restricted
# See http://help.ubuntu.com/community/UpgradeNotes for how to upgrade to
# newer versions of the distribution.
deb http://archive.ubuntu.com/ubuntu precise main restricted
deb-src http://archive.ubuntu.com/ubuntu precise main restricted
## Major bug fix updates produced after the final release of the
## distribution.
deb http://archive.ubuntu.com/ubuntu precise-updates main restricted
deb-src http://archive.ubuntu.com/ubuntu precise-updates main restricted
## N.B. software from this repository is ENTIRELY UNSUPPORTED by the Ubuntu
## team. Also, please note that software in universe WILL NOT receive any
## review or updates from the Ubuntu security team.
deb http://archive.ubuntu.com/ubuntu precise universe
deb-src http://archive.ubuntu.com/ubuntu precise universe
deb http://archive.ubuntu.com/ubuntu precise-updates universe
deb-src http://archive.ubuntu.com/ubuntu precise-updates universe
## N.B. software from this repository is ENTIRELY UNSUPPORTED by the Ubuntu
## team, and may not be under a free licence. Please satisfy yourself as to
## your rights to use the software. Also, please note that software in
## multiverse WILL NOT receive any review or updates from the Ubuntu
## security team.
deb http://archive.ubuntu.com/ubuntu precise multiverse
deb-src http://archive.ubuntu.com/ubuntu precise multiverse
deb http://archive.ubuntu.com/ubuntu precise-updates multiverse
deb-src http://archive.ubuntu.com/ubuntu precise-updates multiverse
## N.B. software from this repository may not have been tested as
## extensively as that contained in the main release, although it includes
## newer versions of some applications which may provide useful features.
## Also, please note that software in backports WILL NOT receive any review
## or updates from the Ubuntu security team.
deb http://archive.ubuntu.com/ubuntu precise-backports main restricted universe multiverse
deb-src http://archive.ubuntu.com/ubuntu precise-backports main restricted universe multiverse
deb http://archive.ubuntu.com/ubuntu precise-security main restricted
deb-src http://archive.ubuntu.com/ubuntu precise-security main restricted
deb http://archive.ubuntu.com/ubuntu precise-security universe
deb-src http://archive.ubuntu.com/ubuntu precise-security universe
deb http://archive.ubuntu.com/ubuntu precise-security multiverse
deb-src http://archive.ubuntu.com/ubuntu precise-security multiverse
## Uncomment the following two lines to add software from Canonical's
## 'partner' repository.
## This software is not part of Ubuntu, but is offered by Canonical and the
## respective vendors as a service to Ubuntu users.
# deb http://archive.canonical.com/ubuntu precise partner
# deb-src http://archive.canonical.com/ubuntu precise partner
## This software is not part of Ubuntu, but is offered by third-party
## developers who want to ship their latest software.
deb http://extras.ubuntu.com/ubuntu precise main
# deb-src http://extras.ubuntu.com/ubuntu precise main
3番目の編集：レコードの場合、lsb_release -aが表示されます
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 12.04 LTS
Release: 12.04
Codename: precise
4番目の編集（20120512）：今日見たapt-get updateの出力は次のとおりです。
Inspiron-1545：〜$高速
Ign http://archive.ubuntu.com precise InRelease
Ign http://archive.ubuntu.com precise-updates InRelease
Ign http://archive.ubuntu.com precise-security InRelease
Ign http://archive.canonical.com precise InRelease
Ign http://extras.ubuntu.com precise InRelease
Ign http://ppa.launchpad.net precise InRelease
Ign http://ppa.launchpad.net precise InRelease
Get:1 http://archive.ubuntu.com precise Release.gpg [198 B]
Get:2 http://archive.ubuntu.com precise-updates Release.gpg [198 B]
Hit http://archive.canonical.com precise Release.gpg
Hit http://extras.ubuntu.com precise Release.gpg
Hit http://ppa.launchpad.net precise Release.gpg
Get:3 http://archive.ubuntu.com precise-security Release.gpg [198 B]
Get:4 http://archive.ubuntu.com precise Release [49.6 kB]
Hit http://archive.canonical.com precise Release
Hit http://extras.ubuntu.com precise Release
Hit http://ppa.launchpad.net precise Release.gpg
Hit http://archive.canonical.com precise/partner i386 Packages
Hit http://extras.ubuntu.com precise/main i386 Packages
Hit http://ppa.launchpad.net precise Release
Get:5 http://archive.ubuntu.com precise-updates Release [49.6 kB]
Ign http://archive.canonical.com precise/partner TranslationIndex
Ign http://extras.ubuntu.com precise/main TranslationIndex
Hit http://ppa.launchpad.net precise Release
Get:6 http://archive.ubuntu.com precise-security Release [49.6 kB]
Hit http://ppa.launchpad.net precise/main i386 Packages
Ign http://ppa.launchpad.net precise/main TranslationIndex
Hit http://ppa.launchpad.net precise/main i386 Packages
Ign http://ppa.launchpad.net precise/main TranslationIndex
Ign http://archive.canonical.com precise/partner Translation-en_IN
Ign http://extras.ubuntu.com precise/main Translation-en_IN
Ign http://archive.canonical.com precise/partner Translation-en
Ign http://extras.ubuntu.com precise/main Translation-en
Ign http://ppa.launchpad.net precise/main Translation-en_IN
Ign http://ppa.launchpad.net precise/main Translation-en
Ign http://ppa.launchpad.net precise/main Translation-en_IN
Get:7 http://archive.ubuntu.com precise/main i386 Packages [1,274 kB]
Ign http://ppa.launchpad.net precise/main Translation-en
Get:8 http://archive.ubuntu.com precise/restricted i386 Packages [8,431 B]
Get:9 http://archive.ubuntu.com precise/universe i386 Packages [4,796 kB]
Get:10 http://archive.ubuntu.com precise/multiverse i386 Packages [121 kB]
Hit http://archive.ubuntu.com precise/main TranslationIndex
Hit http://archive.ubuntu.com precise/multiverse TranslationIndex
Hit http://archive.ubuntu.com precise/restricted TranslationIndex
Hit http://archive.ubuntu.com precise/universe TranslationIndex
Get:11 http://archive.ubuntu.com precise-updates/main i386 Packages [96.5 kB]
Get:12 http://archive.ubuntu.com precise-updates/main i386 Packages [96.5 kB]
Get:13 http://archive.ubuntu.com precise-updates/restricted i386 Packages [770 B]
Get:14 http://archive.ubuntu.com precise-updates/universe i386 Packages [27.7 kB]
Get:15 http://archive.ubuntu.com precise-updates/multiverse i386 Packages [1,393 B]
Hit http://archive.ubuntu.com precise-updates/main TranslationIndex
Hit http://archive.ubuntu.com precise-updates/multiverse TranslationIndex
Hit http://archive.ubuntu.com precise-updates/restricted TranslationIndex
Hit http://archive.ubuntu.com precise-updates/universe TranslationIndex
Get:16 http://archive.ubuntu.com precise-security/main i386 Packages [32.9 kB]
Get:17 http://archive.ubuntu.com precise-security/restricted i386 Packages [14 B]
Get:18 http://archive.ubuntu.com precise-security/universe i386 Packages [8,594 B]
Get:19 http://archive.ubuntu.com precise-security/multiverse i386 Packages [1,393 B]
Hit http://archive.ubuntu.com precise-security/main TranslationIndex
Hit http://archive.ubuntu.com precise-security/multiverse TranslationIndex
Hit http://archive.ubuntu.com precise-security/restricted TranslationIndex
Hit http://archive.ubuntu.com precise-security/universe TranslationIndex
Hit http://archive.ubuntu.com precise/main Translation-en
Hit http://archive.ubuntu.com precise/multiverse Translation-en
Hit http://archive.ubuntu.com precise/restricted Translation-en
Hit http://archive.ubuntu.com precise/universe Translation-en
Hit http://archive.ubuntu.com precise-updates/main Translation-en
Hit http://archive.ubuntu.com precise-updates/multiverse Translation-en
Hit http://archive.ubuntu.com precise-updates/restricted Translation-en
Hit http://archive.ubuntu.com precise-updates/universe Translation-en
Hit http://archive.ubuntu.com precise-security/main Translation-en
Hit http://archive.ubuntu.com precise-security/multiverse Translation-en
Hit http://archive.ubuntu.com precise-security/restricted Translation-en
Hit http://archive.ubuntu.com precise-security/universe Translation-en
Fetched 6,494 kB in 2min 51s (37.9 kB/s)
Reading package lists... Done
Working...
No files to download.
Reading package lists... Done
Building dependency tree
Reading state information... Done
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
-e
Done! Verify that all packages were installed successfully. If errors are found, run apt-get clean as root and try again using apt-get directly.
（最初の行のfastは、apt-fastの代わりにapt-getを使用しているためです）
Mikewhateverの回答ごとにapt.confのdeb-src行を無効にしました。これにより、あなたと同じように、最大6MBになりました。
次に、aptがパッケージ情報を取得しているときに、192.168.1.3（私のsquid-deb-proxyサーバー（11.10を実行します。まだアップグレードしていません）を通過していることに気付きました。クライアントからsquid-deb-proxy-clientをアンインストールすると、情報のダウンロードサイズが通常に戻りました。
編集：Aaandそれはその古い振る舞いに戻りました。また、Macで仮想マシンをチェックし（安定版リリースがリリースされたその日から新規インストール）、時々起動します。パッケージ更新情報も同様に大きなダウンロードです。この解決策が機能しないことを文書化するために、この回答はそのままにしておきます。それを超えて、私は立ち往生しています。
おそらく、違いはソースパッケージです。 [ソフトウェアソース]ウィンドウで無効にするか、/etc/apt/sources.listを編集し、deb-srcで始まる行をコメントアウトしてください。つまり、ソースコードが不要な場合です。