This question already has an answer here:
What benefits would I see upgrading from 14.04 to 15.04 and what are some caveats? My system is pretty solid running on a dual core i5, 8gb, 512ssd, hd3000. I'm a newer Linux user and I don't do a lot of CLI foo, only How To's that seem interesting. Any thoughts on this issue? Should this be asked in the chat?
14before the . means the year released2014. And the04after the . means the month04 = April. I didn't see if that was answered for you or not, so I am just passing the info on. – Terrance May 6 '15 at 23:37