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Sometimes, after login, it goes to a black screen without any hard disk activity while mouse cursor works.

I login to the terminal by pressing Ctrl + Alt + F4 and restart the X server using this command

sudo restart lightdm

Then login screen appears again and this time it goes to desktop after login.

How can I find the problem? I looked at system log but couldn't find any special thing.

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Sometimes me also face the same problem in Ubuntu 13.10. – Avinash Raj Feb 20 '14 at 8:50
Same here, want to know whether it is a bug. – Deepal Feb 20 '14 at 8:53

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