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Thunderbird has been upgraded to 60.2.1 but it does not display Tasks and Calendar. Please fix the problem.

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This is the first time I have a problem with Thunderbird.

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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more options

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.