"AttributeError: 'NoneType' object has no attribute 'cancel'"
I think you found another way to hit this bug:
https://bugs.launchpad.net/ubuntu/+source/calibre/+bug/1898904
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** Project changed: calibre => calibre (Ubuntu)
** Changed in: calibre (Ubuntu)
Status: Invalid => New
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https://bugs.launchpad.net/bugs/1899700
Title:
[Regression] Does not
