Thunderbird has been upgraded to 60.2.1 but it does not display Tasks and Calendar. Please fix the problem.
This is the first time I have a problem with Thunderbird.
Chosen solution
So the solution is:
remove the lightning add-on in Thunderbird; exit from Thunderbird; install xul-ext-lightning package with
sudo apt install xul-ext-lightning (it will pull more packages in).
restart Thunderbird.
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There's a problem with Linux users and Lightning in TB 60. See if this post helps:
https://support.mozilla.org/en-US/questions/1237279#answer-1164578
Chosen Solution
So the solution is:
remove the lightning add-on in Thunderbird; exit from Thunderbird; install xul-ext-lightning package with
sudo apt install xul-ext-lightning (it will pull more packages in).
restart Thunderbird.
That should work if Lightning wasn't present in the original installer, but if it was, but is not visible, the preference reset described here should also work.