AttributeError when launching calibre

[Mathieu Tarral]

Since the latest calibre update, the software doesn't want to start anymore.

There is a Python traceback when I run it in a terminal

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'

Can you rollback calibre to a previous working version ?

Thanks.

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: calibre 4.99.4+dfsg+really4.12.0-1build1
ProcVersionSignature: Ubuntu 5.4.0-48.52-generic 5.4.60
Uname: Linux 5.4.0-48-generic x86_64
NonfreeKernelModules: nvidia_modeset nvidia
ApportVersion: 2.20.11-0ubuntu27.9
Architecture: amd64
CasperMD5CheckResult: skip
CurrentDesktop: ubuntu:GNOME
Date: Sat Oct 10 23:04:11 2020
InstallationDate: Installed on 2019-09-26 (380 days ago)
InstallationMedia: Ubuntu 19.04 "Disco Dingo" - Release amd64 (20190416)
PackageArchitecture: all
SourcePackage: calibre
UpgradeStatus: Upgraded to focal on 2020-05-10 (153 days ago)

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[grofaty (grofaty)]

Duplicates:
https://bugs.launchpad.net/ubuntu/+source/calibre/+bug/1894061
https://bugs.launchpad.net/ubuntu/+source/calibre/+bug/1898904
https://bugs.launchpad.net/ubuntu/+source/calibre/+bug/1899259
https://bugs.launchpad.net/ubuntu/+source/calibre/+bug/1899296