This happened due to a crash when changing desktop effects through ccsm which is fixed in the proposed version of unity in natty. For the time being you could reset unity settings by doing the following
1. log in to Unity session 2. press ctrl+alt+f1 3. login with username and password 4. type 'export DISPLAY=:0' 5. then 'unity --reset' 6. come back to tty 7 with ctrl+alt+f7 if thats not the right tty then try 8 or 9. This will solve the problem and with the update it may not happen again so I am closing this bug. if you face it again please re-open this bug ** Changed in: unity Status: New => Invalid ** Changed in: unity (Ubuntu) Status: New => Invalid -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/782736 Title: unity crashed in login with change of compiz desktop and effects -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs