Ubuntu: Can't install any software from software center due to Authentication Error

Can't install any software from software center due to this error.

Software can't be installed or removed because the authentication service is not available.

Screenshot:

Solution:
Workaround : On terminal> sudo software-center. Now try downloading. 
Permanent solution : Install all pending updates.
Alternative solution: You can try using an alternative software manager like synaptic, muon, muon software center, lubuntu software center. Terminal doesn't always have to be the solution.

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