Nowadays Xubuntu uses the Whisker Menu panel plugin by default. It allows the user to easily trigger the lock screen via button click.
http://goodies.xfce.org/projects/panel-plugins/xfce4-whiskermenu-plugin ** Changed in: xfce4-session (Ubuntu) Status: Triaged => Invalid -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1258978 Title: can't lock the screen from the logout dialog To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/xfce4-session/+bug/1258978/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs