【Another app is currently holding the yum lock; waiting for it to exit...】
上网查了，好像是说帮我安个桌面图标的进程。
估计是我没配代理服务器，所以一直拿着yum锁在那里运行，
直接用 yum remove PackageKit 删掉了事
参考
If you really don't like PackageKit, you can remove it by running the following command as root:
yum remove PackageKit
You can also disable PackageKit from checking for updates by running gpk-prefs from the terminal:
gpk-prefs &disown
In the preferences window, change Check for updates to never.