[Bug 2136009] [NEW] software-properties-gtk crashed with AttributeError in __init__(): 'Window' object has no attribute 'set_type_hint'

[Guybrush88]

Public bug reported:

I got this crash when opening software-properties with update-manager

ProblemType: Crash
DistroRelease: Ubuntu 26.04
Package: software-properties-gtk 0.118
ProcVersionSignature: Ubuntu 6.17.0-6.6-generic 6.17.1
Uname: Linux 6.17.0-6-generic x86_64
ApportVersion: 2.33.1-0ubuntu3
Architecture: amd64
CasperMD5CheckResult: unknown
CurrentDesktop: LXQt
Date: Sat Dec 13 23:02:44 2025
ExecutablePath: /usr/bin/software-properties-gtk
ExecutableTimestamp: 1765317197
InstallationDate: Installed on 2025-09-09 (95 days ago)
InstallationMedia: Lubuntu 25.04 "Plucky Puffin" - Release amd64 (20250417)
InterpreterPath: /usr/bin/python3.13
JournalErrors:
 dic 13 23:02:36 davide-k50in wpa_supplicant[1172]: wlp4s0: RSC 0000000000000746 is likely bogus, using 0
 dic 13 23:02:36 davide-k50in ModemManager[4105]: <wrn> [plugin-manager] task 3,wlp4s0: error when checking support with plugin 'generic': (generic) Missing port probe for port (net/wlp4s0)
 dic 13 23:02:37 davide-k50in systemd-resolved[448]: Using degraded feature set UDP instead of UDP+EDNS0 for DNS server 192.168.1.1.
 dic 13 23:02:42 davide-k50in org.debian.apt[5153]: 23:02:42 AptDaemon [INFO]: Quitting due to inactivity
 dic 13 23:02:42 davide-k50in org.debian.apt[5153]: 23:02:42 AptDaemon [INFO]: Quitting was requested
PackageArchitecture: all
ProcCmdline: /usr/bin/python3 /usr/bin/software-properties-gtk --open-tab 2 --toplevel 50331651
ProcCwd: /home/davide
Python3Details: /usr/bin/python3.13, Python 3.13.11, python3-minimal, 3.13.7-1
PythonArgs: ['/usr/bin/software-properties-gtk', '--open-tab', '2', '--toplevel', '50331651']
PythonDetails: N/A
SourcePackage: software-properties
Title: software-properties-gtk crashed with AttributeError in __init__(): 'Window' object has no attribute 'set_type_hint'
UpgradeStatus: Upgraded to resolute on 2025-10-17 (57 days ago)
UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo

** Affects: software-properties (Ubuntu)
     Importance: Medium
         Status: New


** Tags: amd64 apport-crash resolute

** Information type changed from Private to Public

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https://bugs.launchpad.net/bugs/2136009

Title:
  software-properties-gtk crashed with AttributeError in __init__():
  'Window' object has no attribute 'set_type_hint'

Status in software-properties package in Ubuntu:
  New

Bug description:
  I got this crash when opening software-properties with update-manager

  ProblemType: Crash
  DistroRelease: Ubuntu 26.04
  Package: software-properties-gtk 0.118
  ProcVersionSignature: Ubuntu 6.17.0-6.6-generic 6.17.1
  Uname: Linux 6.17.0-6-generic x86_64
  ApportVersion: 2.33.1-0ubuntu3
  Architecture: amd64
  CasperMD5CheckResult: unknown
  CurrentDesktop: LXQt
  Date: Sat Dec 13 23:02:44 2025
  ExecutablePath: /usr/bin/software-properties-gtk
  ExecutableTimestamp: 1765317197
  InstallationDate: Installed on 2025-09-09 (95 days ago)
  InstallationMedia: Lubuntu 25.04 "Plucky Puffin" - Release amd64 (20250417)
  InterpreterPath: /usr/bin/python3.13
  JournalErrors:
   dic 13 23:02:36 davide-k50in wpa_supplicant[1172]: wlp4s0: RSC 0000000000000746 is likely bogus, using 0
   dic 13 23:02:36 davide-k50in ModemManager[4105]: <wrn> [plugin-manager] task 3,wlp4s0: error when checking support with plugin 'generic': (generic) Missing port probe for port (net/wlp4s0)
   dic 13 23:02:37 davide-k50in systemd-resolved[448]: Using degraded feature set UDP instead of UDP+EDNS0 for DNS server 192.168.1.1.
   dic 13 23:02:42 davide-k50in org.debian.apt[5153]: 23:02:42 AptDaemon [INFO]: Quitting due to inactivity
   dic 13 23:02:42 davide-k50in org.debian.apt[5153]: 23:02:42 AptDaemon [INFO]: Quitting was requested
  PackageArchitecture: all
  ProcCmdline: /usr/bin/python3 /usr/bin/software-properties-gtk --open-tab 2 --toplevel 50331651
  ProcCwd: /home/davide
  Python3Details: /usr/bin/python3.13, Python 3.13.11, python3-minimal, 3.13.7-1
  PythonArgs: ['/usr/bin/software-properties-gtk', '--open-tab', '2', '--toplevel', '50331651']
  PythonDetails: N/A
  SourcePackage: software-properties
  Title: software-properties-gtk crashed with AttributeError in __init__(): 'Window' object has no attribute 'set_type_hint'
  UpgradeStatus: Upgraded to resolute on 2025-10-17 (57 days ago)
  UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo

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