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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