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[Evan Huus <1898904@xxxxxxxxxxxxxxxxxx>]

Per https://bugzilla.redhat.com/show_bug.cgi?id=1840780#c2 this happens
on python >= 3.8.3. As Focal ships 3.8.5 we get this bug. Juanjo linked
and attached the upstream patch already, which is included in Calibre >=
4.15. Focal ships Calibre version 4.99.4 which I assume is some pre-
release version of the Calibre 5 series which didn't yet include this
fix. Calibre 5 is now available and presumably would also fix this
issue.

** Summary changed:

- Calibre crashes at startup with "/usr/bin/calibre, line 20" error
+ Calibre crashes at startup with AttributeError: 'NoneType' object has no attribute 'cancel'

** Bug watch added: Red Hat Bugzilla #1840780
   https://bugzilla.redhat.com/show_bug.cgi?id=1840780

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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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