I have installed the calibre 4.99.4+dfsg+really4.12.0-1ubuntu1 package version 
from the proposed archive in Kubuntu 20.04. Calibre starts successfully. 
However, please note that I previously had patched the 
4.99.4+dfsg+really4.12.0-1build1 version as suggested in #9, so it was starting 
anyway in my system.
No conflict was given on apt install of the new version though, perhaps the 
patch being applied is exactly the same as that in #9?

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https://bugs.launchpad.net/bugs/1898904

Title:
  Calibre crashes at startup with AttributeError: 'NoneType' object has
  no attribute 'cancel'

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