to edit your source.list
sudo gedit /etc/apt/source.list
and make changes click save.

:)

On 06/15/2012 10:01 AM, Lachhu wrote:
My GNU version is Ubuntu 12.04 as you had mentioned in example
The Update center  used to have no problem earlier.

I could not add Universe in the source.list; I didn't know where to go... hehe its seems so shameful :D

Thanks for helping guys... :)

On Thursday, June 14, 2012 1:05:31 PM UTC+5:45, Lachhu wrote:

    Hey People there,

         I have been having problem with Update Manager.
    The recommended updates and the new released updates are checked
    properly but when I install the updates the following message pops up:
        Requires Installation of untrusted packages
           The action would require the installation of packages from
    not authenticated sources.

    And the installation can't proceed.

    Does anybody have any idea about solving this?

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