As defined it is not invalid, because it _is_ a Bug. It will be resolved later, when a compatible Version of Lightning will be made available at Thunderbird-Add-On-Search. (I could not chose "Won't fix") So i changed its Status to "In Progress"
** Changed in: thunderbird (Ubuntu) Status: Invalid => In Progress -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1797945 Title: Lightning incompatible with Thunderbird 60.2.1 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/thunderbird/+bug/1797945/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs