我最近从 Ubuntu 12.10 升级到了 13.04，从那时起我就强烈地感觉到我没有收到主要软件包的任何更新。
事实上，自从 15 天前升级到 Ubuntu 13.04 以来，我sudo apt-get update经常运行并查看哪些软件包已更新。根据我使用 Ubuntu 的经验，我可以说我只获得了 PPA（如 Novacut）和合作伙伴存储库（如 Skype）的更新。我没有获得其他软件包的更新。
运行时我没有收到任何错误消息 sudo apt-get update。我仍然能够使用软件中心或命令行安装我想要的任何内容。以下是的内容/etc/apt/sources.list：
# deb cdrom:[Ubuntu 13.04 _Raring Ringtail_ - Alpha amd64 (20130402.1)]/ raring main restricted
# deb cdrom:[Ubuntu 12.10 _Quantal Quetzal_ - Release amd64 (20121017.5)]/ quantal main restricted
# See http://help.ubuntu.com/community/UpgradeNotes for how to upgrade to
# newer versions of the distribution.
deb http://ftp.uni-erlangen.de/mirrors/ubuntu/ raring main restricted universe
## Major bug fix updates produced after the final release of the
## distribution.
deb http://ftp.uni-erlangen.de/mirrors/ubuntu/ raring-updates main restricted universe
## 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.
## 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://ftp.uni-erlangen.de/mirrors/ubuntu/ raring multiverse
deb http://ftp.uni-erlangen.de/mirrors/ubuntu/ raring-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://ftp.uni-erlangen.de/mirrors/ubuntu/ raring-security main restricted universe
deb http://ftp.uni-erlangen.de/mirrors/ubuntu/ raring-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-src http://archive.canonical.com/ubuntu quantal 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 raring main
# deb-src http://extras.ubuntu.com/ubuntu quantal main
deb http://repository.spotify.com stable non-free #Spotify
# deb http://apt.last.fm/debian raring main #Last.fm disabled on upgrade to raring
# See http://help.ubuntu.com/community/UpgradeNotes for how to upgrade to
# newer versions of the distribution.
## Major bug fix updates produced after the final release of the
## distribution.
## 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.
## 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.
## 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.
## 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 raring partner
## This software is not part of Ubuntu, but is offered by third-party
## developers who want to ship their latest software.
deb-src http://extras.ubuntu.com/ubuntu raring main
我如何检查我的印象是否正确？我该如何纠正这个问题？
我尝试删除该/etc/apt/sources.list文件，然后通过运行更新自动重新填充它，但没有任何变化。
答案1
您的 sources.list 看起来与我的类似（这是全新安装的 raring）。
您可以从终端执行以下操作：
sudo apt-get 更新|grep main
如果 apt 正在检查主仓库的更新，你应该看到类似这样的行：“Hithttp://ftp.uni-erlangen.de/mirrors/ubuntu/raring/main Translation-en”（Translation-en 只是一个例子，还应该有其他行）
如果您从命令行（sudo apt-get dist-upgrade）进行更新，您将知道它们被从哪里提取。
例如今天早上（5 月 4 日）有来自主内核的升级）
答案2
我将软件源从当地大学（埃尔兰根，请参阅 sources.list 文件）切换到德国主要软件源。现在软件更新程序确实下载了更新，包括内核更新響鳴正在谈论。