如何删除先前运行的错误命令？

Question

我从Noobslabs.com上运行命令

deb-src http://ppa.launchpad.net/noobslab/themes/ubuntu precise main

但被误判为

deb-src http://ppa.launchpad.net/noobslab/themes/ubuntu precise main ain

现在，这个错误的命令正在阻止其他应用程序正常工作，而我使用的任何应用程序都会在某个时候崩溃。

所显示的问题是：

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/noobslab-themes-precise.list']"

我该怎么解决这个问题？

Answer 1

这应能解决以下问题：

sudo sed -i 's/ ain//' /etc/apt/sources.list.d/noobslab-themes-precise.list

否则，运行sudoedit /etc/apt/sources.list.d/noobslab-themes-precise.list并手动修复行。