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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?

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some screenshot would be nice –  penreturn Aug 29 '12 at 18:49
    
Is your internet connection working fine for other applications? –  carnendil Aug 29 '12 at 19:13
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3 Answers

Do you have an active internet connecting? Check your connecting 1st and ensure it's working properly.Then open Ubuntu software centre and cancel if any repair window pop-up.

Go to

Edit > Software Source

in Ubuntu software Tab select

Download From to Main Server

Then Close Everything. Press ctrl+alt+t to open a terminal. Type

sudo apt-get update

sudo apt-get upgrade

if upgrade failed then try with these

sudo apt-get -f install

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Nice suggestion:

"Edit" -> "Software Sources", in "Ubuntu software" tab select "Download From to Main Server". Then close everything, press Ctrl+Alt+T to open a terminal and type:

sudo apt-get update
sudo apt-get upgrade

If upgrade failed then try with these:

sudo apt-get -f install
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Try to clean apt cache and software center cache:

sudo apt-get clean
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