I am new to Linux so please bear with me, I have 12.04 installed, when I am trying to download from Ubuntu Software Center or if I try to check for updates via Update Manager, I get this message:
Requires installation of untrusted packages.
and there are two buttons: OK and Repair. If I click OK, it does nothing, but if I click Repair then I get this message:
Failed to download repository information.
then I click on OK to close the message box then this message appears:
Check Internet connection.
Is there any way to fix it?