Just for the record, I'd just encountered this problem on a Linux Mint box and the 'Workaround' of the 'Bug description' has solved it:
$ uname -a Linux 3.2.0-58-generic #88-Ubuntu SMP Tue Dec 3 17:37:58 UTC 2013 x86_64 x86_64 x86_64 GNU/Linux $ cat /etc/linuxmint/info RELEASE=13 CODENAME=maya EDITION="MATE 64-bit" DESCRIPTION="Linux Mint 13 Maya" DESKTOP=MATE TOOLKIT=GTK Thanks a lot! -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to the bug report. https://bugs.launchpad.net/bugs/24061 Title: GPG error with apt-get/aptitude/update-manager behind proxy (BADSIG 40976EAF437D05B5) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/apt/+bug/24061/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs