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Ubuntu - 12.04 Update manager and software center is not working

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linux-howto

http://askubuntu.com – I have Ubuntu 12.04 LTS installed in my machine. Update manager and software center is not working after applying some packages through update manager. The following is the error trace I got, when I executed the command update-manager on a terminal. I tried to resolved this by reinstalling python once and then upgrading the python to 2.7.4. But the issue remains same. Can anybody please help me on this? Traceback (most recent call last): File "/usr/bin/update-manager", line 33, in from UpdateManager.UpdateManager import UpdateManager File "/usr/lib/python2.7/dist-packages/UpdateM (HowTos)