Public bug reported: The following error appears when I'm running apt-get update:
$ sudo apt-get update Hit http://ch.archive.ubuntu.com precise-updates/multiverse Translation-en Hit http://ch.archive.ubuntu.com precise-updates/restricted Translation-en Hit http://ch.archive.ubuntu.com precise-updates/universe Translation-en Reading package lists... Done W: GPG error: http://ppa.launchpad.net precise Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 4F191A5A8844C542 ** Affects: apport (Ubuntu) Importance: Undecided Status: New -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1053861 Title: W: GPG error: http://ppa.launchpad.net precise Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 4F191A5A8844C542 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/apport/+bug/1053861/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs