Yum How To Install Software
I am new Linux. When I log in with root or user. I open Terminal, I type "su -" with user and enter password, it is OK. I want install software by "Yum".
$ yum install numlockx //I enter then it message
Loading "Installonlyn" Plugin
Setting up Install Process
Cannot find a valid baseurl for repo:core
Error cannot find baseurl for repo:core
I don't understand how to install software by yum. I tried to install others software by yum but all of them have a same message above. And
I can't open Add/Remove Program, it is warning unable. May I know reason why ?