I can reproduce this on the live system. The package "ubuntu-extras- keyring" is installed, but "sudo apt-key list" does not show the extras signing key. A "sudo apt-get install --reinstall ubuntu-extras-keyring" fixes the issue.
** Changed in: ubuntu-extras-keyring (Ubuntu) Status: New => Confirmed ** Changed in: ubuntu-extras-keyring (Ubuntu) Importance: Undecided => High ** Changed in: ubuntu-extras-keyring (Ubuntu) Milestone: None => ubuntu-10.10 -- Failed to fetch http://extras.ubuntu.com/ubuntu/dists/maverick/Release ; missing key https://bugs.launchpad.net/bugs/650525 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs