似乎我的源列表中有一个我无法找到的问题；每次我尝试打开突触时都会出现此错误：
E: Malformed line 57 in source list /etc/apt/sources.list (dist parse)
E: The list of sources could not be read.
Go to the repository dialog to correct the problem.
E: _cache->open() failed, please report.
打开我的源列表，第 57 行似乎不存在，就是这样；
（我是新用户，只能发布两个超链接 - 这是最后两行，我怀疑其中一行是问题所在......）
deb-src http://extras.ubuntu.com/ubuntu quantal main
deb-src http://archive.canonical.com partner
我尝试寻找解决方案并发现了类似的问题，只是不确定我应该删除/替换哪一行......
# deb cdrom:[Ubuntu 12.10 _Quantal Quetzal_ - Release i386 (20121017.2)]/ quantal main restricted
# See http://help.ubuntu.com/community/UpgradeNotes for how to upgrade to
# newer versions of the distribution.
deb http://de.archive.ubuntu.com/ubuntu/ quantal main restricted
deb-src http://de.archive.ubuntu.com/ubuntu/ quantal main restricted
## Major bug fix updates produced after the final release of the
## distribution
deb http://de.archive.ubuntu.com/ubuntu/ quantal-updates main restricted
deb-src http://de.archive.ubuntu.com/ubuntu/ quantal-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://de.archive.ubuntu.com/ubuntu/ quantal universe
deb-src http://de.archive.ubuntu.com/ubuntu/ quantal universe
deb http://de.archive.ubuntu.com/ubuntu/ quantal-updates universe
deb-src http://de.archive.ubuntu.com/ubuntu/ quantal-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://de.archive.ubuntu.com/ubuntu/ quantal multiverse
deb-src http://de.archive.ubuntu.com/ubuntu/ quantal multiverse
deb http://de.archive.ubuntu.com/ubuntu/ quantal-updates multiverse
deb-src http://de.archive.ubuntu.com/ubuntu/ quantal-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://de.archive.ubuntu.com/ubuntu/ quantal-backports main restricted universe multiverse
deb-src http://de.archive.ubuntu.com/ubuntu/ quantal-backports main restricted universe multiverse
deb http://security.ubuntu.com/ubuntu quantal-security main restricted
deb-src http://security.ubuntu.com/ubuntu quantal-security main restricted
deb http://security.ubuntu.com/ubuntu quantal-security universe
deb-src http://security.ubuntu.com/ubuntu quantal-security universe
deb http://security.ubuntu.com/ubuntu quantal-security multiverse
deb-src http://security.ubuntu.com/ubuntu quantal-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 quantal partner
# 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 quantal main
deb-src http://extras.ubuntu.com/ubuntu quantal main
deb-src http://archive.canonical.com partner
答案1
您的第二行在 URL 和 之间缺少分发版本（量子）partner。
编辑：在整个文件中，每个条目必须采用以下形式：
deb|deb-src URL distrib archive [archive […]]
第 29 行：
deb-src http://de.archive.ubuntu.com/ubuntu/ quantal-updates multiverse>
应该：
deb-src http://de.archive.ubuntu.com/ubuntu/ quantal-updates multiverse
第 44 行：
deb-src http://security.ubuntu.com/ubuntu quantal-security multiverse>
应该：
deb-src http://security.ubuntu.com/ubuntu quantal-security multiverse
第 51 行（无所谓，因为已被注释掉）：
# deb-src http://archive.canonical.com/ubuntu quantal partner>
应该：
deb-src http://archive.canonical.com/ubuntu quantal partner
第 57 行 (最后一行)：
deb-src http://archive.canonical.com partner
应该：
deb-src http://archive.canonical.com quantal partner
其余部分似乎正确。不过，我还没有用 aptitude 验证过。