There are unfinished transactions remaining. You might consider running yum-complete-transaction first to finish them

When I was using yum to install a package, I've received a

"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."

Apparently, there were aborted or incomplete yum transactions on the system.

First thing First Make sure you have yum-utils package

# yum install yum-utils

Next,run the yum-complete-transaction. You may want to run the yum-transaction --cleanup which is a safe option

# yum-complete-transaction --cleanup-only