Normally to get authorization in the GUI Ubuntu pops up a screen asking for 
your password.
Can you try to run the update proces from a terminal?
The command below will simulate the upgrading of the packages.
If it spits out any error,can you please post it here?
$  sudo apt-get -s upgrade

-- 
My upgrade manager is hanging
https://bugs.launchpad.net/bugs/307722
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