BADSIG Cure

Try deleting the key

sudo apt-key del 16126D3A3E5C1192

then updating the repository

sudo apt-get update

You should get a NO_PUBKEY error instead of a BADSIG error and

sudo apt-key finger

should not find the key (called "Ubuntu Extras Archive Automatic Signing Key")
Now add the key

sudo apt-key adv --recv-keys --keyserver keyserver.ubuntu.com 16126D3A3E5C1192

The result of apt-key finger should have

pub   1024D/3E5C1192 2010-09-20
      Key fingerprint = C474 15DF F48C 0964 5B78  6094 1612 6D3A 3E5C 1192
uid                  Ubuntu Extras Archive Automatic Signing Key 

---

If that does not work, try

apt-get clean            # Remove cached packages
cd /var/lib/apt
mv lists lists.old       # Backup mirror info
mkdir -p lists/partial   # Recreate directory structure
apt-get clean
apt-get update           # Fetch mirror info

Source: this ubuntu forums thread

linkimprove this answer

edited Dec 11 '11 at 23:02

answered Dec 9 '11 at 14:35 Portablejim 827112