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 Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1900098 Title: software-properties-gtk fails to open with error To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/software-properties/+bug/1900098/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
