Requires installation of untrusted packages?

Posted by Isaiah Bugarin on Ask Ubuntu See other posts from Ask Ubuntu or by Isaiah Bugarin
Published on 2012-09-04T21:19:45Z Indexed on 2012/09/04 21:50 UTC
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error

I tried installing VLC Player yesterday, and I got the Requires installation of untrusted packages error. I searched for hours for a solution to this problem, and finally came upon a suggestion that said to change servers for downloading updates from. I did this, and it gave me a 404 error when I clicked on "Check" in the Update Manager. I tried switching my server back to the main one (and after that, several other ones), but I am now still getting a 404 error: enter image description here

And the other error I get when downloading or updating: enter image description here

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