As people have been mentioning, this is most likely due to a locally installed Google Calendar provider in addition to having xul-ext-gdata- provider installed. The locally installed addon with take precedence, so if you remove that, you should be up to date.
** Changed in: thunderbird (Ubuntu) Status: Confirmed => Incomplete ** Package changed: thunderbird (Ubuntu) => lightning-extension (Ubuntu) -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1032359 Title: Thunderbird no longer displays Google Calendar To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/lightning-extension/+bug/1032359/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs