完整的报警如下：
Another app is currently holding the yum lock; waiting for it to exit...
The other application is: PackageKit
Memory : 168 M RSS (594 MB VSZ)
Started: Wed Nov 10 23:44:56 2021 - 15:09 ago
State : Sleeping, pid: 9687
解决方法
sudo rm -f /var/run/yum.pid
或杀掉进程
