software-properties-gtk generates python errors

[W. Bourgeois]

Launching software-properties-gtk gives all these Python errors after having upgraded to 21.04:

Gtk-Message: 17:32:53.643: Failed to load module "appmenu-gtk-module"
Traceback (most recent call last):
  File "/usr/bin/software-properties-gtk", line 100, in <module>
    app = SoftwarePropertiesGtk(datadir=options.data_dir, options=options, file=file)
  File "/usr/lib/python3/dist-packages/softwareproperties/gtk/SoftwarePropertiesGtk.py", line 196, in __init__
    bus = dbus.SystemBus()
  File "/usr/lib/python3/dist-packages/dbus/_dbus.py", line 195, in __new__
    return Bus.__new__(cls, Bus.TYPE_SYSTEM, mainloop=mainloop,
  File "/usr/lib/python3/dist-packages/dbus/_dbus.py", line 102, in __new__
    bus = BusConnection.__new__(subclass, bus_type, mainloop=mainloop)
  File "/usr/lib/python3/dist-packages/dbus/bus.py", line 124, in __new__
    bus = cls._new_for_bus(address_or_type, mainloop=mainloop)
dbus.exceptions.DBusException: org.freedesktop.DBus.Error.LimitsExceeded: The maximum number of active connections for UID 1000 has been reached

Version: 0.99.10

ProblemType: Bug
DistroRelease: Ubuntu 21.04
Package: software-properties-common 0.99.10
ProcVersionSignature: Ubuntu 5.11.0-18.19-generic 5.11.17
Uname: Linux 5.11.0-18-generic x86_64
NonfreeKernelModules: nvidia_modeset nvidia
ApportVersion: 2.20.11-0ubuntu65.1
Architecture: amd64
CasperMD5CheckResult: unknown
CurrentDesktop: MATE
Date: Fri Jun 11 17:36:34 2021
InstallationDate: Installed on 2020-09-06 (277 days ago)
InstallationMedia: Ubuntu-MATE 20.04.1 LTS "Focal Fossa" - Release amd64 (20200731)
PackageArchitecture: all
ProcEnviron:
 LANGUAGE=fr_FR
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=fr_FR.UTF-8
 SHELL=/bin/bash
SourcePackage: software-properties
UpgradeStatus: Upgraded to hirsute on 2021-06-08 (2 days ago)

[Sebastien Bacher (seb128)]

Thank you for your bug report, the error suggests the system has no dbus connection left to allocate. Does it happen in specific circonstances? What is active on your system at the time of the issue?

[W. Bourgeois (roundsoftstudio)]

I'm attaching the contents of sudo systemctl status as a text file.

It appears that I can actually launch software-properties, but only as sudo. The direct link in the Ubuntu menu won't work.

It seems it is more related to dbus, but I am not sure.

[Launchpad Janitor (janitor)]

[Expired for software-properties (Ubuntu) because there has been no activity for 60 days.]