I have upgraded to Ubuntu yesterday. I used the terminal with the command
sudo do-release-upgrade -d
in order to upgrade ,since update manager does not give me the option to upgrade to Ubuntu 15.04.
It said that there was an error whole updating but I have not recorded it bit I remember it saying something like
"your computer is in an unusable state".
Now It can boot fast but after logging in to my profile, I could not run any programs and my computer just freezes. I have not encountered any problems like this with 14.10; my computer was running very smoothly. What do I do?