Исправление проблемы apt-get - BADSIG

Иногда при apt-get update вылетает нехорошая ошибка типа:

W: GPG error: http://archive.ubuntu.com jaunty Release: The following signatures were invalid: BADSIG 40976EAF437D05B5 Ubuntu Archive Automatic Signing Key [email protected]

W: A error occurred during the signature verification. The repository is not updated and the previous index files will be used.GPG error: http://archive.ubuntu.com jaunty-updates Release: The following signatures were invalid: BADSIG 40976EAF437D05B5 Ubuntu Archive Automatic Signing Key [email protected]

W: A error occurred during the signature verification. The repository is not updated and the previous index files will be used.GPG error: http://archive.ubuntu.com jaunty-security Release: The following signatures were invalid: BADSIG 40976EAF437D05B5 Ubuntu Archive Automatic Signing Key [email protected]

W: GPG error: http://archive.canonical.com jaunty Release: The following signatures were invalid: BADSIG 40976EAF437D05B5 Ubuntu Archive Automatic Signing Key [email protected]

W: Failed to fetch http://archive.ubuntu.com/ubuntu/dists/jaunty-updates/Release

W: Failed to fetch http://archive.ubuntu.com/ubuntu/dists/jaunty-security/Release

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

W: You may want to run apt-get update to correct these problems

Вылечить ее очень просто:

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