几周前，我愚蠢地将var文件夹移到了根文件夹中，整个系统崩溃了。我设法解决了一些问题，但是我的网站无法正常工作，因为apache2无法运行/不存在 当我运行命令
sudo service apache2
我得到：
Failed to restart apache2.service: Unit apache2.service not found.
我跑步时
sudo apt-get install apache2
我明白了
Reading package lists... Done
Building dependency tree
Reading state information... Done
Package apache2 is not available, but is referred to by another package.
This may mean that the package is missing, has been obsoleted, or
is only available from another source
E: Package 'apache2' has no installation candidate
我真的不知道如何解决这个问题。我用默认配置替换了/etc/apt/sources.list。