Calibre crashes on start

[Michal]

OS: Ubuntu 20.04
I have been using calibre for a long time without issues.
Today, I have failed to start it from the OS GUI.
When starting from the terminal, I've got the following output:
$ calibre
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'

I have tried to reboot the PC, as well as reinstall calibre (sudo apt-get). A week or so ago the calibre worked fine.

[Kovid Goyal (kovid)]

The calibre package in Ubuntu is broken, please uninstall it and use the official calibre binaries from https://calibre-ebook.com/download_linux

 duplicate 1898904