[Bug 545778] Re: xul-ext-lightning is only available in English

[Piraten-Kris Pseudonym]

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

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https://bugs.launchpad.net/bugs/545778

Title:
  xul-ext-lightning is only available in English

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