Got the same problem too, which I found very annoying. I was very surprised to have such a blocking bug with regular Ubuntu updates.
Here is my fix : - go to https://www.thunderbird.net/fr/ (yes, I use french version) - download latest Thunderbird tarball (v 60.2.1) - extract it to a dir - then use it : $ ./thunderbird Now Thunderbird and Lightning just work ! This means not using the Ubuntu package anymore as it is broken. Now I can wait and see if the next Ubuntu updates fix the problem. Else I'll use Mozilla packages directly, as they update smoother. -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to thunderbird in Ubuntu. https://bugs.launchpad.net/bugs/1797945 Title: Lightning incompatible with Thunderbird 60.2.1 Status in thunderbird package in Ubuntu: Confirmed Bug description: Hi Today I got the update from Thunderbird 52 to 60.2.1. Unfortunately Lightning doesn't work anymore. Thunderbird reports that Lightning is incompatible with Thunderbird 60.2.1. Regards, Ettore To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/thunderbird/+bug/1797945/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : desktop-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp
