Those errors are from gconf, and other applications have the same issue too. In any case, those errors aren't fatal, and the only thing that Thunderbird is using for gconf is proxy settings.
** Package changed: thunderbird (Ubuntu) => gconf (Ubuntu) -- You received this bug notification because you are a member of Ubuntu Desktop Bugs, which is subscribed to gconf in Ubuntu. https://bugs.launchpad.net/bugs/877019 Title: Thunderbird can't modify any gconf settings To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gconf/+bug/877019/+subscriptions -- desktop-bugs mailing list desktop-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/desktop-bugs