I encountered the same error (see duplicate https://bugs.launchpad.net/ubuntu/+source/software- properties/+bug/1930974/comments/5) and was able to resolve the issue by reinstalling packages "python3-six" and "python3-certifi" as suggested in https://bugs.launchpad.net/ubuntu/+source/software- properties/+bug/1900098/comments/2. Those packages were installed before.
The relevant journalctl section is: May 18 18:45:47 gungnir dbus-daemon[1746]: [system] Activating service name='com.ubuntu.SoftwareProperties' requested by ':1.7781' (uid=1000 pid=497419 comm="/usr/bin/python3 /usr/bin/software-properties-gtk " label="unconfined") (using servicehelper) May 18 18:45:48 gungnir com.ubuntu.SoftwareProperties[497432]: Unable to init server: Could not connect: Connection refused May 18 18:45:48 gungnir com.ubuntu.SoftwareProperties[497432]: Unable to init server: Could not connect: Connection refused May 18 18:45:48 gungnir dbus-daemon[1746]: [system] Successfully activated service 'com.ubuntu.SoftwareProperties' May 18 18:45:48 gungnir com.ubuntu.SoftwareProperties[497432]: Traceback (most recent call last): May 18 18:45:48 gungnir com.ubuntu.SoftwareProperties[497432]: File "/usr/lib/software-properties/software-properties-dbus", line 68, in <module> May 18 18:45:48 gungnir com.ubuntu.SoftwareProperties[497432]: server = SoftwarePropertiesDBus(bus, datadir=datadir) May 18 18:45:48 gungnir com.ubuntu.SoftwareProperties[497432]: File "/lib/python3/dist-packages/softwareproperties/dbus/SoftwarePropertiesDBus.py", line 66, in __init__ May 18 18:45:48 gungnir com.ubuntu.SoftwareProperties[497432]: self._livepatch_service = LivepatchService() May 18 18:45:48 gungnir com.ubuntu.SoftwareProperties[497432]: File "/lib/python3/dist-packages/softwareproperties/LivepatchService.py", line 93, in __init__ May 18 18:45:48 gungnir com.ubuntu.SoftwareProperties[497432]: self._session = requests_unixsocket.Session() May 18 18:45:48 gungnir com.ubuntu.SoftwareProperties[497432]: NameError: name 'requests_unixsocket' is not defined May 18 18:45:48 gungnir com.ubuntu.SoftwareProperties[497432]: Error in sys.excepthook: May 18 18:45:48 gungnir com.ubuntu.SoftwareProperties[497432]: Traceback (most recent call last): May 18 18:45:48 gungnir com.ubuntu.SoftwareProperties[497432]: File "/lib/python3/dist-packages/apport_python_hook.py", line 72, in apport_excepthook May 18 18:45:48 gungnir com.ubuntu.SoftwareProperties[497432]: from apport.fileutils import likely_packaged, get_recent_crashes May 18 18:45:48 gungnir com.ubuntu.SoftwareProperties[497432]: File "/lib/python3/dist-packages/apport/__init__.py", line 5, in <module> May 18 18:45:48 gungnir com.ubuntu.SoftwareProperties[497432]: from apport.report import Report May 18 18:45:48 gungnir com.ubuntu.SoftwareProperties[497432]: File "/lib/python3/dist-packages/apport/report.py", line 32, in <module> May 18 18:45:48 gungnir com.ubuntu.SoftwareProperties[497432]: import apport.fileutils May 18 18:45:48 gungnir com.ubuntu.SoftwareProperties[497432]: File "/lib/python3/dist-packages/apport/fileutils.py", line 12, in <module> May 18 18:45:48 gungnir com.ubuntu.SoftwareProperties[497432]: import os, glob, subprocess, os.path, time, pwd, sys, requests_unixsocket May 18 18:45:48 gungnir com.ubuntu.SoftwareProperties[497432]: File "/lib/python3/dist-packages/requests_unixsocket/__init__.py", line 1, in <module> May 18 18:45:48 gungnir com.ubuntu.SoftwareProperties[497432]: import requests May 18 18:45:48 gungnir com.ubuntu.SoftwareProperties[497432]: File "/lib/python3/dist-packages/requests/__init__.py", line 112, in <module> May 18 18:45:48 gungnir com.ubuntu.SoftwareProperties[497432]: from . import utils May 18 18:45:48 gungnir com.ubuntu.SoftwareProperties[497432]: File "/lib/python3/dist-packages/requests/utils.py", line 24, in <module> May 18 18:45:48 gungnir com.ubuntu.SoftwareProperties[497432]: from . import certs May 18 18:45:48 gungnir com.ubuntu.SoftwareProperties[497432]: File "/lib/python3/dist-packages/requests/certs.py", line 15, in <module> May 18 18:45:48 gungnir com.ubuntu.SoftwareProperties[497432]: from certifi import where May 18 18:45:48 gungnir com.ubuntu.SoftwareProperties[497432]: ModuleNotFoundError: No module named 'certifi' May 18 18:45:48 gungnir com.ubuntu.SoftwareProperties[497432]: Original exception was: May 18 18:45:48 gungnir com.ubuntu.SoftwareProperties[497432]: Traceback (most recent call last): May 18 18:45:48 gungnir com.ubuntu.SoftwareProperties[497432]: File "/usr/lib/software-properties/software-properties-dbus", line 68, in <module> May 18 18:45:48 gungnir com.ubuntu.SoftwareProperties[497432]: server = SoftwarePropertiesDBus(bus, datadir=datadir) May 18 18:45:48 gungnir com.ubuntu.SoftwareProperties[497432]: File "/lib/python3/dist-packages/softwareproperties/dbus/SoftwarePropertiesDBus.py", line 66, in __init__ May 18 18:45:48 gungnir com.ubuntu.SoftwareProperties[497432]: self._livepatch_service = LivepatchService() May 18 18:45:48 gungnir com.ubuntu.SoftwareProperties[497432]: File "/lib/python3/dist-packages/softwareproperties/LivepatchService.py", line 93, in __init__ May 18 18:45:48 gungnir com.ubuntu.SoftwareProperties[497432]: self._session = requests_unixsocket.Session() May 18 18:45:48 gungnir com.ubuntu.SoftwareProperties[497432]: NameError: name 'requests_unixsocket' is not defined May 18 18:45:48 gungnir software-properties-drivers.desktop[497419]: ERROR:dbus.proxies:Introspect error on :1.7782:/: dbus.exceptions.DBusException: org.freedesktop.DBus.Error.NoReply: Message recipient disconnected from message bus without replying May 18 18:45:48 gungnir software-properties-drivers.desktop[497419]: Traceback (most recent call last): May 18 18:45:48 gungnir software-properties-drivers.desktop[497419]: File "/usr/bin/software-properties-gtk", line 100, in <module> May 18 18:45:48 gungnir software-properties-drivers.desktop[497419]: app = SoftwarePropertiesGtk(datadir=options.data_dir, options=options, file=file) May 18 18:45:48 gungnir software-properties-drivers.desktop[497419]: File "/usr/lib/python3/dist-packages/softwareproperties/gtk/SoftwarePropertiesGtk.py", line 222, in __init__ May 18 18:45:48 gungnir software-properties-drivers.desktop[497419]: self.backend.Reload(); May 18 18:45:48 gungnir software-properties-drivers.desktop[497419]: File "/usr/lib/python3/dist-packages/dbus/proxies.py", line 72, in __call__ May 18 18:45:48 gungnir software-properties-drivers.desktop[497419]: return self._proxy_method(*args, **keywords) May 18 18:45:48 gungnir software-properties-drivers.desktop[497419]: File "/usr/lib/python3/dist-packages/dbus/proxies.py", line 141, in __call__ May 18 18:45:48 gungnir software-properties-drivers.desktop[497419]: return self._connection.call_blocking(self._named_service, May 18 18:45:48 gungnir software-properties-drivers.desktop[497419]: File "/usr/lib/python3/dist-packages/dbus/connection.py", line 652, in call_blocking May 18 18:45:48 gungnir software-properties-drivers.desktop[497419]: reply_message = self.send_message_with_reply_and_block( May 18 18:45:48 gungnir software-properties-drivers.desktop[497419]: dbus.exceptions.DBusException: org.freedesktop.DBus.Error.ServiceUnknown: The name :1.7782 was not provided by any .service files May 18 18:45:48 gungnir systemd[1]: Starting Process error reports when automatic reporting is enabled... May 18 18:45:48 gungnir systemd[2437]: gnome-launched-software-properties-drivers.desktop-497419.scope: Succeeded. -- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to software-properties in Ubuntu. https://bugs.launchpad.net/bugs/1900098 Title: software-properties-gtk fails to open with error Status in software-properties package in Ubuntu: Expired Bug description: When trying to open software-properties-gtk via Terminal (via GUI: “Settings & Livepatch”) the following error is returned in the terminal and software-properties-gtk does not open. ERROR:dbus.proxies:Introspect error on :1.121:/: dbus.exceptions.DBusException: org.freedesktop.DBus.Error.NoReply: Message recipient disconnected from message bus without replying 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 211, in __init__ self.backend.Reload(); File "/usr/lib/python3/dist-packages/dbus/proxies.py", line 72, in __call__ return self._proxy_method(*args, **keywords) File "/usr/lib/python3/dist-packages/dbus/proxies.py", line 141, in __call__ return self._connection.call_blocking(self._named_service, File "/usr/lib/python3/dist-packages/dbus/connection.py", line 652, in call_blocking reply_message = self.send_message_with_reply_and_block( dbus.exceptions.DBusException: org.freedesktop.DBus.Error.ServiceUnknown: The name :1.121 was not provided by any .service files ProblemType: Bug DistroRelease: Ubuntu 20.04 Package: software-properties-gtk 0.98.9.2 ProcVersionSignature: Ubuntu 5.4.0-51.56-generic 5.4.65 Uname: Linux 5.4.0-51-generic x86_64 ApportVersion: 2.20.11-0ubuntu27.9 Architecture: amd64 CasperMD5CheckResult: skip CurrentDesktop: ubuntu:GNOME Date: Fri Oct 16 08:17:15 2020 InstallationDate: Installed on 2020-10-09 (6 days ago) InstallationMedia: Ubuntu 20.04.1 LTS "Focal Fossa" - Release amd64 (20200731) PackageArchitecture: all SourcePackage: software-properties UpgradeStatus: No upgrade log present (probably fresh install) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/software-properties/+bug/1900098/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : touch-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp
