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. :)
You may have missing keys, this can easily be solved but first you need to run update to see what the missing key is.
You will now get an error saying that some public key is not available. To add it just run:
Replace with the key that the error when you did apt-get update showed. Example, Ubuntu default repositories key is 437D05B5