I just brought up an Ubunt 12.04 instance on rackspace and I have some users that I am wondering about:
I see a couple of users on ubuntu 12.04 server which I don't seem like they need shell access: games, man, lp, news, irc.
Is shell access necessary for these users/services? Can I disable them. I'm just paranoid because one of my servers was hacked and I just want to make sure everything is clean this time around.