问题表现：
在执行yum update更新系统时因卡住、SSH意外断开等原因导致更新被打断后，再次执行更新会抛出错误：
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.
解决方法：
安装安装yum-complete-transaction
yum install -y yum-utils
运行运行yum-complete-transaction
yum-complete-transaction
再次执行更新即可
yum update