The package xfce4 depends on thunar, and starting with 18.10 thunar now recommends policykit-1-gnome.
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=842378 ** Bug watch added: Debian Bug tracker #842378 https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=842378 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1821364 Title: xfce4 install on Ubuntu 18.04 has no polkit agent To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/xfce4/+bug/1821364/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs