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I've checked several forums and sites for trying to fix this issue. This issue has been happening for the last three days. I'm a bit of a newbie to Linux but I think I've managed to narrow down where the issue is.

I've recently been getting an error like this E: GPG error: raring Release: The following signatures were invalid: NODATA 1 NODATA 2

every time with "sudo apt-get update". Also been getting a red warning triangle warning me update information is outdated and may be caused by network issues or outdated repository. After some intense google searching a few people have had a similar issue but it seemed to be with 13.03.

From what I gather, I am missing GPG keys that is causing the issue (tried resetting them to default in the settings but no luck). There was a link to what appeared to be the PGP key for raring Release but I can't make heads or tails of what to do with it:

I am really hoping someone here may know what to do.

Thank you for your help

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Please add your answer and then you will be able to accept the answer to close the thread. Thankyou. – fossfreedom May 21 '13 at 20:03
up vote 0 down vote accepted

It was caused due to a misspelled link as you can see in E: GPG error: raring Release: The following signatures were invalid: NODATA 1 NODATA 2 it says "arcgive" it needs to be "archive" to change this, type sudo gedit /etc/apt/sources.list and fix the typo where you see it (in this case: deb-src raring partner needed to be edited to: deb-src raring partner) hit save now the issue should be fixed and then type sudo apt-get update to check and it should now find any missing updates. This also fixed the issue of not being able to download from the Ubuntu Software Centre or install via apt

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