Muon Update Manager error

Paul Stear paul at
Fri Nov 16 12:11:39 UTC 2012

Hi all,
This error has just started today and I am baffled.

The system informed me that security updates were available, so I clicked on 
the icon and the Software updates screen appeared. I then clicked install 
Updates and a screen saying 
The following pieces of software cannot be authenticated. WARNING: Installing 
unverified...... so I clicked continue and then get the error message:-
This operation cannot continue since proper authorisation was not provided.

In the past I would have had a screen asking for password but today this was 
not displayed.

I hope I have explained this OK,
Any ideas how to solve this and do the updates?

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