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[elwood <1899035@xxxxxxxxxxxxxxxxxx>]

*** This bug is a duplicate of bug 1898904 ***
    https://bugs.launchpad.net/bugs/1898904

** Description changed:

  from syslog:
- Oct  8 16:24:07 mirian-pc systemd[1754]: Started Application launched by gnome-shell.
- Oct  8 16:24:07 mirian-pc calibre-gui.desktop[299116]: Traceback (most recent call last):
- Oct  8 16:24:07 mirian-pc calibre-gui.desktop[299116]:   File "/usr/bin/calibre", line 20, in <module>
- Oct  8 16:24:07 mirian-pc calibre-gui.desktop[299116]:     sys.exit(calibre())
- Oct  8 16:24:07 mirian-pc calibre-gui.desktop[299116]:   File "/usr/lib/calibre/calibre/gui_launch.py", line 73, in calibre
- Oct  8 16:24:07 mirian-pc calibre-gui.desktop[299116]:     main(args)
- Oct  8 16:24:07 mirian-pc calibre-gui.desktop[299116]:   File "/usr/lib/calibre/calibre/gui2/main.py", line 543, in main
- Oct  8 16:24:07 mirian-pc calibre-gui.desktop[299116]:     listener = create_listener()
- Oct  8 16:24:07 mirian-pc calibre-gui.desktop[299116]:   File "/usr/lib/calibre/calibre/gui2/main.py", line 514, in create_listener
- Oct  8 16:24:07 mirian-pc calibre-gui.desktop[299116]:     return Listener(address=gui_socket_address())
- Oct  8 16:24:07 mirian-pc calibre-gui.desktop[299116]:   File "/usr/lib/calibre/calibre/utils/ipc/server.py", line 110, in __init__
- Oct  8 16:24:07 mirian-pc calibre-gui.desktop[299116]:     self._listener._unlink.cancel()
- Oct  8 16:24:07 mirian-pc calibre-gui.desktop[299116]: AttributeError: 'NoneType' object has no attribute 'cancel'
- Oct  8 16:24:07 mirian-pc systemd[1754]: gnome-launched-calibre-gui.desktop-299116.scope: Succeeded.
- 
+ Oct  8 16:24:07 n-pc systemd[1754]: Started Application launched by gnome-shell.
+ Oct  8 16:24:07 n-pc calibre-gui.desktop[299116]: Traceback (most recent call last):
+ Oct  8 16:24:07 n-pc calibre-gui.desktop[299116]:   File "/usr/bin/calibre", line 20, in <module>
+ Oct  8 16:24:07 n-pc calibre-gui.desktop[299116]:     sys.exit(calibre())
+ Oct  8 16:24:07 n-pc calibre-gui.desktop[299116]:   File "/usr/lib/calibre/calibre/gui_launch.py", line 73, in calibre
+ Oct  8 16:24:07 n-pc calibre-gui.desktop[299116]:     main(args)
+ Oct  8 16:24:07 n-pc calibre-gui.desktop[299116]:   File "/usr/lib/calibre/calibre/gui2/main.py", line 543, in main
+ Oct  8 16:24:07 n-pc calibre-gui.desktop[299116]:     listener = create_listener()
+ Oct  8 16:24:07 n-pc calibre-gui.desktop[299116]:   File "/usr/lib/calibre/calibre/gui2/main.py", line 514, in create_listener
+ Oct  8 16:24:07 n-pc calibre-gui.desktop[299116]:     return Listener(address=gui_socket_address())
+ Oct  8 16:24:07 n-pc calibre-gui.desktop[299116]:   File "/usr/lib/calibre/calibre/utils/ipc/server.py", line 110, in __init__
+ Oct  8 16:24:07 n-pc calibre-gui.desktop[299116]:     self._listener._unlink.cancel()
+ Oct  8 16:24:07 n-pc calibre-gui.desktop[299116]: AttributeError: 'NoneType' object has no attribute 'cancel'
+ Oct  8 16:24:07 n-pc systemd[1754]: gnome-launched-calibre-gui.desktop-299116.scope: Succeeded.
  
  in terminal:
  $ /usr/bin/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()
+   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'
  
- 
  calibre version:
- 4.99.4+dfsg+really4.12.0-1build1 
+ 4.99.4+dfsg+really4.12.0-1build1
  ubuntu-focal-universe
  
  ubuntu:
  $ uname -a
  Linux linux-pc 5.4.0-48-generic #52-Ubuntu SMP Thu Sep 10 10:58:49 UTC 2020 x86_64 x86_64 x86_64 GNU/Linux
  
  $ python --version
  Python 3.8.5

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https://bugs.launchpad.net/bugs/1899035

Title:
  startup problem on ubuntu 20.04

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