You might consider running yum-complete-transaction first to finish them

Instalando um Elastix tive que parar o upgrade devido a lentidão e após isso ao instalar qualquer programa recebia esta mensagem:

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.

Para resolver este problema basta executar os comandos abaixo:

yum install yum-utils
yum-complete-transaction 

Pronto

problema resolvido

Fuiiiiiiiiiiiiiii!