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[Laurent Malod-Panisset <1885348@xxxxxxxxxxxxxxxxxx>]

Hi

Same problem of Calibre not openning but the terminal output is

Traceback (most recent call last):
  File "/usr/bin/calibre", line 20, in <module>
    sys.exit(calibre())
  File "/usr/lib/calibre/calibre/gui_launch.py", line 73, in calibre
    main(args)
  File "/usr/lib/calibre/calibre/gui2/main.py", line 543, in main
    listener = create_listener()
  File "/usr/lib/calibre/calibre/gui2/main.py", line 514, in create_listener
    return Listener(address=gui_socket_address())
  File "/usr/lib/calibre/calibre/utils/ipc/server.py", line 110, in __init__
    self._listener._unlink.cancel()
AttributeError: 'NoneType' object has no attribute 'cancel'


Not related to opengl

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https://bugs.launchpad.net/bugs/1885348

Title:
  Calibre eBook Viewer doesn't open in Ubuntu 20.04 LTS

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