When you upgrade to a new version of Ubuntu/Debian, then you may see the following message:
Searching google doesn't turn up good hits for fixing this, so i provide here the solution to this problem, which is really simple:Code:WARNING: The following packages cannot be authenticated! foo bar
Code:sudo apt-get remove debian-keyring debian-archive-keyring sudo apt-get clean sudo apt-get update sudo apt-get -y install debian-keyring debian-archive-keyring
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