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I am trying to add or remove applications from Ubuntu Software Center but ending up with the following error

Software can't be installed or removed because the authentication service is 
not available. 
(org.freedesktop.PolicyKit.Error.Failed: ('system-bus-name', {'name': ':1.74'}): 

enter image description here

apt-get install or apt-get remove works good from command line, but doesn't in USC

Any help ???

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marked as duplicate by Javier Rivera, con-f-use, Seth, Eric Carvalho, stephenmyall Feb 18 '13 at 9:29

This question was marked as an exact duplicate of an existing question.

Have you tried uninstalling and reinstalling the software center since apt-get is working fine? – user25656 Feb 17 '13 at 6:24

Try rebooting and then

sudo dpkg --configure -a

There might be another process in the background preventing Ubuntu Software Center from installing what you want.

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tried but, didnt work – vishnu teja Feb 17 '13 at 10:03

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