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I've used Ubunutu in the past, as well as Linux Mint 15 on my desktop. However, I'm using CentOS on my Vaio laptop.
When I click on add remove software, nothing comes up. When I click on "all packages" I get a message saying "no results found." The same thing happens when I click package collections, newest packages, and selected packages.
So if anyone can explain what I need to do to start being able to download and install new software, that would be great.
If yum is segfaulting, something is VERY wrong with your system and it may well have gotten corrupted. What version of CentOS are you running? If you run "rpm -qa", does it return a list of software you have installed?
Well, that would fix it.
Your yum cmd (or a library) was corrupt.
BTW, no need to delete any Centos repos, just check that enabled=0 in the CentOS-Media.repo, CentOS-Vault.repo & CentOS-Debuginfo.repo files.
You're unlikely to need to use them in normal usage, but if you lose your internet cxn, the CentOS-Media.repo might come in useful.
Now one more question. When I click on add/remove software, I just see names of packages, rather than software, such as Google Chrome, or the Adobe Flash plugin. When I click on "application" in the left hand column, nothing comes up. So if I want to install software, is typing su -c 'yum install software name' my only option? I already installed Gimp, Libre Office, and Totem media player using that command. But is there no other way to do so through a graphical user interface?
As John_VV says, RHEL docco works for Centos, so see his links.
See also www.linuxtopia.org
Re your GUI issue; oddly, I seem to have 2 entries marked 'Applications' which are drop down menus (click the '>' ptr).
They did take a while to provide a list...
This is because it takes a few seconds to run through your repos files, then go and fetch the lists from the remote servers.
It's possible you didn't wait long enough... its also just possible that you don't have repos enabled.
Highly recommend you open a cmd terminal & login as root
to see what repos (if any) are enabled.
Then try the GUI again if you prefer GUI.
yum cli search cmds include
yum search '*name*'
yum info '*name*'
yum provides '*name*'
### and also