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

Update manager claiming that i did't check for updates but i do?

the system is telling me that i did not check for update (last time 20 days ago) but i did a minute ago.. I'm using gnome shell (installed KDE and gnome) here the synaptic output

W: GPG error: http://sd.archive.ubuntu.com oneiric Release: The following signatures were invalid: BADSIG 40976EAF437D05B5 Ubuntu Archive Automatic Signing Key <ftpmaster@ubuntu.com>

W: A error occurred during the signature verification. The repository is not updated and the previous index files will be used. GPG error: http://extras.ubuntu.com oneiric Release: The following signatures were invalid: BADSIG 16126D3A3E5C1192 Ubuntu Extras Archive Automatic Signing Key <ftpmaster@ubuntu.com>

W: Failed to fetch http://extras.ubuntu.com/ubuntu/dists/oneiric/Release  

W: Some index files failed to download. They have been ignored, or old ones used instead.

Thank you in advance...

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Use another mirror. –  Uri Herrera Dec 17 '11 at 5:44
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marked as duplicate by Bruno Pereira Feb 18 '12 at 2:30

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1 Answer

Try these commands...

sudo -i
apt-get clean
cd /var/lib/apt
mv lists lists.old
mkdir -p lists/partial
apt-get clean
apt-get update

This will rebuild the cache !

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