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My Update Manager in Ubuntu 12.04 pops up this message while installing updates: 'Requires installation of untrusted packages. The action would require the installation of packages from not authenticated sources'. In Details: 'gnome-control-center gnome-control-center -data libgnome-control-center'

How to solve the problem?

Thankyou. :)

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You may have missing keys, this can easily be solved but first you need to run update to see what the missing key is.

sudo apt-get update

You will now get an error saying that some public key is not available. To add it just run:

sudo apt-key adv --recv-keys --keyserver keyserver.ubuntu.com <key>

Replace with the key that the error when you did apt-get update showed. Example, Ubuntu default repositories key is 437D05B5

sudo apt-key adv --recv-keys --keyserver keyserver.ubuntu.com 437D05B5
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