Confirmed on clean install of Kubuntu 18.04.3. It seems to be a bug with kdesu rather than muon itself: kdesu freezes if given a wrong password also calling other commands, for example when launching KDE partition manager from the KDE menu.
-- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1579585 Title: muon freezes when we enter wrong password To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/muon/+bug/1579585/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs