I am new to ubuntu I now have ubuntu 12.04 and I want to upgrade them to 12.10 and then to 13.04. So I follow some steps I installed 12.10 but when I reboot it I couldn't login and all I get was a black screen and nothing else. I pressed alt+ctr+f1 I logged in and I could use the terminal. So I reinstall 12.04 from usb and I need to know what to do to upgrade them successfully...
From a quick search I think that this is a problem from graphics card. I have ATI Radeon hd 5500 and also when I opened them I could see the purple screen and then it turned black and I couldn't do anything. Sorry for my really bad english too.