Ubuntu 16.04. Thunderbird 60.2.1 (64 bits) Calendar has disappeared.
That change in Thunderbird, which is automatically updated, costed me 1 hour of research and work. How many hours these guys took from ppl around the world? Is seems they just don't care. Because, maybe, they become big.
For now:
1. Remove Lighting from Thunderbird.
2. Close Thunderbird
3. sudo apt install xul-ext-lightning
4. Start Thunderbird again.
Calendar is here again.
Or... you may try to download and install appropriate version of Lighting:
- versions: https://developer.mozilla.org/en-US/docs/Mozilla/Calendar/Calendar_Versions#Stable_Releases
- downloads: https://ftp.mozilla.org/pub/calendar/lightning/candidates/
For tomorrow, seriously consider different pim tool, because you may find yourself in not comfortable situation.
