Ubuntu – Ubuntu can’t update some repositories

authenticationrepositorytroubleshooting

Possible Duplicate:
What is the easiest way to resolve apt-get BADSIG GPG errors?

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Why can't Ubuntu update some repositories? especially from extras.ubuntu.com, PPA Tualatrix for Ubuntu Tweak, and Docky PPA.

In below, shows all my authentic keys, is any wrong?

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sorry for my english

Best Answer

It appears that something must have broken your keys.

Try this:

sudo apt-key adv --recv-keys --keyserver keyserver.ubuntu.com 16126D3A3E5C1192
sudo apt-key adv --recv-keys --keyserver keyserver.ubuntu.com 6AF0E1940624A220
sudo apt-key adv --recv-keys --keyserver keyserver.ubuntu.com 608BF7B93528AE20
sudo apt-key adv --recv-keys --keyserver keyserver.ubuntu.com 3BDAAC08614C4B38
sudo apt-get update
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