It looks like you might have an old, incompatible version of the
enigmail extension installed.
Can you share the output of `apt policy enigmail` ?
If you open the extensions settings and check out the details for
enigmail, what version is displayed?
** Changed in: thunderbird (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1846882
Title:
Thunderbird crashes when clicking on menu item
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