用Yum更新的过程中，如果突然按下Ctrl+C，可能出现如下错误，并弹窗：
There are unfinished transactions remaining. You might consider running yum-complete-transaction first to finish them.
The program yum-complete-transaction is found in the yum-utils package.
意思是说存在没有完成的yum事务，建议先运行yum-complete-transaction命令结束它们。
处理步骤：
# 安装 yum-complete-transaction
yum install yum-utils
# 运行 yum-complete-transaction
yum-complete-transaction –cleanup-only
# 清除可能存在的重复包
package-cleanup --dupes
# 清除可能存在的损坏包
package-cleanup --problems