I am having similar problem in Lubuntu 18.04 LTS. I found it originally when I run 'Software and Updates' from the menu (software-properties- gtk) and try to check/uncheck software sources. Checking/unchecking does not work. I can only see the error message "ERROR:root:Authentication canceled, changes have not been saved" if I run it from the command line.
-- You received this bug notification because you are a member of Ubuntu Desktop Bugs, which is subscribed to gnome-shell in Ubuntu. https://bugs.launchpad.net/bugs/1734095 Title: After upgrade to ubuntu 17.10 Software & Updates not showing authorization popup [gnome-shell[N]: pushModal: invocation of begin_modal failed] To manage notifications about this bug go to: https://bugs.launchpad.net/gnome-shell/+bug/1734095/+subscriptions -- desktop-bugs mailing list desktop-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/desktop-bugs
