可能重复：
apt-get 更新列表的大小太大
后干净的安装 12.04（候选发布版本）并接受迄今为止的所有更新和升级，我发现它sudo apt-get update总是获取 MB 范围内的信息，大约 12 MB，而sudo apt-get upgrade大多数情况下无需下载。
我看到的最大的三个获取量是：
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]
我很确定sudo apt-get update11.10 中的获取量不会太大，甚至很少超过 1 MB。
我的问题是：这些大型获取仅仅是因为 12.04 是最近的，还是这些大型更新是常态？
编辑：为了回应迈克的回答，我发布了一些截图：
第二次编辑：我附上了我的礼物/etc/apt/sources.list。这是后我取消了之前在“其他软件”图像中勾选的“源代码”条目。
# 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
第三次编辑：为了记录，lsb_release -a显示
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 12.04 LTS
Release: 12.04
Codename: precise
apt-get update第四次编辑（20120512）：这是我今天看到的输出：
Inspiron-1545：速度快~$
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.
（fast第一行是因为我使用的apt-fast是 而不是apt-get）
答案1
我按照 mikewhatever 的回答禁用了 apt.conf 的deb-src行。这样，就像你的情况一样，它就缩小到了约 6MB。
然后我注意到，当 apt 获取软件包信息时，它通过 192.168.1.3 — 我的squid-deb-proxy服务器（运行 11.10；我还没有来得及升级它）。squid-deb-proxy-client从客户端卸载后，信息下载大小恢复正常。
编辑：然后它又恢复了原来的样子。我还检查了我 Mac 上的虚拟机（稳定版本发布当天全新安装的），我时不时地会启动它；软件包更新信息也需要大量下载。我留下这个答案只是为了证明这个解决方案不起作用。除此之外，我陷入了困境。
答案2
也许区别在于源包。尝试在“软件源”窗口中禁用它们，或者编辑/etc/apt/sources.list，并注释掉以 开头的行deb-src...也就是说，如果您不需要源代码。