Possible Duplicate:
What is the easiest way to resolve apt-get BADSIG GPG errors?
I have had too much troubled with this error. I have installed a fresh version of Ubuntu 11.10 and then it smoothly ran for 2 days. But, when I run sudo apt-get update I get this error message:
W: GPG error: http://security.ubuntu.com oneiric-security Release: The following signatures were invalid: BADSIG 40976EAF437D05B5 Ubuntu Archive Automatic Signing Key
I have tried this method but it doesn't solve the problem:
sudo -i
# apt-get clean
# cd /var/lib/apt
# mv lists lists.old
# mkdir -p lists/partial
# apt-get clean
# apt-get update
What did I do I have tried all the methods but it again comes. What is the reason for this? Please help me!
