It appears that this command did the trick (took it from here: https://askubuntu.com/questions/1171211/ubuntu-18-04-software- properties-gtk-failing-with-org-freedesktop-dbus-error-ser).
sudo apt-get update && sudo apt-get install --reinstall python3-six python3-certifi Would be nice to have a professional explanation of what was "messed up". Thanks! -- 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: New 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
