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[grofaty <1898904@xxxxxxxxxxxxxxxxxx>]

Public bug reported:

On Ubuntu 20.04 few months ago I installed Calibre from Ubuntu Store
official repository.

I have been using Calibre for months, but today opening it from Ubuntu
Launcher and nothing happens, no error.

Executing:
calibre
from terminal and the 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'
============

Command:
calibre --version
outputs:
calibre (calibre 4.99.4)

I tried:
sudo apt purge calibre
sudo apt autoremove
sudo apt install calibre
but the problem is the same.

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
ApportVersion: 2.20.11-0ubuntu27.9
Architecture: amd64
CasperMD5CheckResult: skip
CurrentDesktop: ubuntu:GNOME
Date: Wed Oct  7 18:07:57 2020
InstallationDate: Installed on 2019-10-23 (350 days ago)
InstallationMedia: Ubuntu 18.04.3 LTS "Bionic Beaver" - Release amd64 (20190805)
PackageArchitecture: all
SourcePackage: calibre
UpgradeStatus: Upgraded to focal on 2020-08-14 (54 days ago)
modified.conffile..etc.default.apport: [modified]
mtime.conffile..etc.default.apport: 2020-04-29T17:08:03.553351

** Affects: calibre (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug focal

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https://bugs.launchpad.net/bugs/1898904

Title:
  Calibre does not start anymore

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