我收到以下消息：
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 'b-src' is not known on line 2 in source list /etc/apt/sources.list.d/cdemu-ppa-precise.list'
答案1
该问题是由于 CDEmu PPA 的源列表格式不正确造成的。运行以下命令重命名 PPA 的源列表，然后打开软件中心或更新管理器：
sudo mv /etc/apt/sources.list.d/cdemu-ppa-precise.list /etc/apt/sources.list.d/cdemu-ppa-precise.list.bak
似乎CDEmu 已放弃支持适用于 Ubuntu 12.04，因此您可以根据需要删除 CDEmu 的源列表。