[Bug 2154196] Re: Software properties qt wont launch because of syntax errors in its code - Kubuntu 26.04

[Andy Glaros]

** Description changed:

  Title:
  software-properties-qt crashes on launch with AttributeError: Qt.PartiallyChecked on Kubuntu 26.04
  
  Description:
  Every time I launch software-properties-qt on Kubuntu 26.04, it immediately crashes.
  
  Steps to reproduce:
  
  1. Open terminal
  2. Run:
     software-properties-qt
  
  Expected result:
  The Software Sources window opens normally.
  
  Actual result:
  The application crashes immediately with:
  
  Traceback (most recent call last):
    File "/usr/bin/software-properties-qt", line 130, in <module>
      app = SoftwarePropertiesQt(datadir=data_dir, options=options, file=afile, attachWinID=attachWinID)
    File "/usr/lib/python3/dist-packages/softwareproperties/qt/SoftwarePropertiesQt.py", line 164, in __init__
      self.show_distro()
      ~~~~~~~~~~~~~~~~^^
    File "/usr/lib/python3/dist-packages/softwareproperties/qt/SoftwarePropertiesQt.py", line 376, in show_distro
      child.setCheckState(Qt.PartiallyChecked)
                          ^^^^^^^^^^^^^^^^^^^
  AttributeError: type object 'Qt' has no attribute 'PartiallyChecked'
  
+ And trying to run it through pkexec reveals that the history repeats
+ itself again and again as it seems to be a time problem that keeps
+ happening on most new releases.
+ 
+ andygl at hp15s:~$ pkexec software-properties-qt
+ qt.qpa.xcb: could not connect to display 
+ qt.qpa.plugin: From 6.5.0, xcb-cursor0 or libxcb-cursor0 is needed to load the Qt xcb platform plugin.
+ qt.qpa.plugin: Could not load the Qt platform plugin "xcb" in "" even though it was found.
+ This application failed to start because no Qt platform plugin could be initialized. Reinstalling the application may fix this problem.
+ 
+ Available platform plugins are: eglfs, minimalegl, wayland-brcm,
+ wayland-egl, wayland, vnc, minimal, linuxfb, vkkhrdisplay, xcb,
+ offscreen.
+ 
+ Aborted                    (core dumped) pkexec software-properties-qt
+ andygl at hp15s:~$ 
+ 
+ 
+ 
  System:
  
  * Kubuntu 26.04
  * Happens every launch
  * Installed via normal system packages
  
  Additional information:
  Possibly related to a Qt/PyQt API change where Qt.PartiallyChecked may now live under Qt.CheckState.PartiallyChecked.
  
  Package: software-properties-qt 0.120
  ApportVersion: 2.34.0-0ubuntu2
  Arch: amd64
  OS: Kubuntu 25.10 "Questing Quokka" - Release amd64 (20251007)
  Upgrade status: Upgraded to resolute on 2026-05-22 (3 days ago)
  Uname: Linux 7.0.0-15-generic x86_64

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https://bugs.launchpad.net/bugs/2154196

Title:
  Software properties qt wont launch because of syntax errors in its
  code - Kubuntu 26.04

Status in software-properties package in Ubuntu:
  New

Bug description:
  Title:
  software-properties-qt crashes on launch with AttributeError: Qt.PartiallyChecked on Kubuntu 26.04

  Description:
  Every time I launch software-properties-qt on Kubuntu 26.04, it immediately crashes.

  Steps to reproduce:

  1. Open terminal
  2. Run:
     software-properties-qt

  Expected result:
  The Software Sources window opens normally.

  Actual result:
  The application crashes immediately with:

  Traceback (most recent call last):
    File "/usr/bin/software-properties-qt", line 130, in <module>
      app = SoftwarePropertiesQt(datadir=data_dir, options=options, file=afile, attachWinID=attachWinID)
    File "/usr/lib/python3/dist-packages/softwareproperties/qt/SoftwarePropertiesQt.py", line 164, in __init__
      self.show_distro()
      ~~~~~~~~~~~~~~~~^^
    File "/usr/lib/python3/dist-packages/softwareproperties/qt/SoftwarePropertiesQt.py", line 376, in show_distro
      child.setCheckState(Qt.PartiallyChecked)
                          ^^^^^^^^^^^^^^^^^^^
  AttributeError: type object 'Qt' has no attribute 'PartiallyChecked'

  And trying to run it through pkexec reveals that the history repeats
  itself again and again as it seems to be a time problem that keeps
  happening on most new releases.

  andygl at hp15s:~$ pkexec software-properties-qt
  qt.qpa.xcb: could not connect to display 
  qt.qpa.plugin: From 6.5.0, xcb-cursor0 or libxcb-cursor0 is needed to load the Qt xcb platform plugin.
  qt.qpa.plugin: Could not load the Qt platform plugin "xcb" in "" even though it was found.
  This application failed to start because no Qt platform plugin could be initialized. Reinstalling the application may fix this problem.

  Available platform plugins are: eglfs, minimalegl, wayland-brcm,
  wayland-egl, wayland, vnc, minimal, linuxfb, vkkhrdisplay, xcb,
  offscreen.

  Aborted                    (core dumped) pkexec software-properties-qt
  andygl at hp15s:~$ 



  System:

  * Kubuntu 26.04
  * Happens every launch
  * Installed via normal system packages

  Additional information:
  Possibly related to a Qt/PyQt API change where Qt.PartiallyChecked may now live under Qt.CheckState.PartiallyChecked.

  Package: software-properties-qt 0.120
  ApportVersion: 2.34.0-0ubuntu2
  Arch: amd64
  OS: Kubuntu 25.10 "Questing Quokka" - Release amd64 (20251007)
  Upgrade status: Upgraded to resolute on 2026-05-22 (3 days ago)
  Uname: Linux 7.0.0-15-generic x86_64

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