从 10.04 升级到 12.04 后，我尝试安装不同的软件包。例如 ia32-libs 和 Skype (4.0)。
尝试安装这些时，我收到“无法纠正问题，您保存了损坏的软件包”错误消息。
命令的输出：
sudo apt-get install -f
Reading package lists... Done
Building dependency tree
Reading state information... Done
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
运行后：
sudo dpkg --configure -a
foo@foo:~$ sudo apt-get install -f
Reading package lists... Done
Building dependency tree
Reading state information... Done
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
我想备份我添加到 Ubuntu 软件中心的所有存储库，但显然sources.list只包含属于 Canonical的存储库。
那么我在哪里可以找到其他的呢？
我尝试在 Ubuntu 18.04 上安装 clang，但无法安装。我尝试sudo apt install clang并得到了这些结果：
Reading package lists... Done
Building dependency tree
Reading state information... Done
Some packages could not be installed. This may mean that you have
requested an impossible situation or if you are using the unstable
distribution that some required packages have not yet been created
or been moved out of Incoming.
The following information may help to resolve the situation:
The following packages have unmet dependencies:
clang : Depends: clang-6.0 (>= …