【Another app is currently holding the yum lock; waiting for it to exit...】
上網查了，好像是說幫我安個桌面圖標的進程。
估計是我沒配代理服務器，所以一直拿着yum鎖在那里運行，
直接用 yum remove PackageKit 刪掉了事
參考
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.