更新管理器/软件中心不工作（12.04 LTS）

Question

我重启了电脑，然后出现了一个带有水平白线的小红圈。我点击了它，它要求我显示更新，所以我照做了。接下来，它显示以下内容：

An unresolvable problem occurred while initializing the package information.

Please report this bug against the 'update-manager' package and include the following error message:

'E:Type 'ain' is not known on line 3 in source list /etc/apt/sources.list.d/ehoover-compholio-precise.list, 
 E:The list of sources could not be read., 
 E:The package lists or status file could not be parsed or opened.'

谁能帮帮我吗？

Answer 1

如果你想报告这个错误，请参阅这个答案另一方面，要求解决 bug 的解决方法并不切题在这里。