我试过“apt-get install python-mysqldb”，结果是：
root@ps1svr:~# apt-get install python-mysqldb
Reading package lists... Done
Building dependency tree
Reading state information... Done
Package python-mysqldb 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 'python-mysqldb' has no installation candidate
注意：“apt-get install python3-mysqldb”有效，但是我有很多为 Python 2.x 编写的代码不再运行，这引起了足够多的问题，我可能不得不重新安装 Ubuntu 18.04