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[Amr Ibrahim <1899035@xxxxxxxxxxxxxxxxxx>]

*** This bug is a duplicate of bug 1898904 ***
    https://bugs.launchpad.net/bugs/1898904

** This bug has been marked a duplicate of bug 1898904
   Calibre crashes at startup with AttributeError: 'NoneType' object has no attribute 'cancel'

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https://bugs.launchpad.net/bugs/1899035

Title:
  startup problem on ubuntu 20.04

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