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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?

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