Thanks for your tip
calibre-debug -g
calibre 4.99.4 embedded-python: False is64bit: True
Linux-5.4.0-48-generic-x86_64-with-glibc2.29 Linux ('64bit', 'ELF')
('Linux', '5.4.0-48-generic', '#52-Ubuntu SMP Thu Sep 10 10:58:49 UTC 2020')
Python 3.8.5
Interface language: nl
Turning on automatic hidpi scaling
devicePixelRatio: 1.0
logicalDpi: 96.0 x 96.0
physicalDpi: 91.84180790960451 x 91.7458193979933
Using calibre Qt style: True
Traceback (most recent call last):
File "/usr/bin/calibre-debug", line 20, in <module>
sys.exit(main())
File "/usr/lib/calibre/calibre/debug.py", line 277, in main
calibre(['calibre'] + args[1:])
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'
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