ubuntu 更新失败，以至于ubuntu 软件中心打不开的解决方法
更新失败信息：
Issue - Update manager not functioning,does not read the complete packages,gets error -
Could not initialize the package information
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:Malformed line 59 in source list /etc/apt/
解决方法： gksudo gedit /etc/apt/sources.list 打开该文件后把最后面的第三方软件源全部清除掉，然后重启软件中心，OK!
