You can find Workarounds here: (https://bugs.launchpad.net/ubuntu/+source/thunderbird/+bug/1797945)
If you want the english Version of Lightning, type into a Terminal: sudo apt update sudo apt install xul-ext-lightning If you want a localized Version of Lightning, at the Moment, you cannot use the normal Add-On-Search in Thunderbird (incompatible). Download manually the latest Beta-Version of Lightining for your System- and Language-Version from: https://archive.mozilla.org/pub/calendar/lightning/candidates/ Open Thunderbird > Add-Ons > Extensions > (Remove unwanted english Version of Lightining) > > At the top of the page, click the Gear-Wheel-Button next to the Search-Box to open a menu > Install Add-on From File > Select Download-Folder and the .xpi-File > Install => All your Calendar-Data should be back -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/545778 Title: xul-ext-lightning is only available in English To manage notifications about this bug go to: https://bugs.launchpad.net/hundredpapercuts/+bug/545778/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
