This bug was fixed in the package calibre -
4.99.4+dfsg+really4.12.0-1ubuntu1

---------------
calibre (4.99.4+dfsg+really4.12.0-1ubuntu1) focal; urgency=medium

  * Fix error during startup (LP: #1898904)
    - debian/patches/fix_cancel_attribute.patch: upstream patch to fix
      unknown attribute error in src/calibre/utils/ipc/server.py.

 -- Marc Deslauriers <[email protected]>  Wed, 23 Dec 2020
12:53:50 -0500

** Changed in: calibre (Ubuntu Focal)
       Status: Fix Committed => Fix Released

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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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