Package: lightdm Version: 1.8.3-1 Followup-For: bug #728361 --- System Information: Debian Release: jessie/sid Kernel: Linux 3.12-rc7-amd64 I am using xfce4 (version 4.10.1) and get the same issue, after upgrading lightdm/1.6.3-1 to version 1.8.2-1 and 1.8.3-1 the restart/shutdown buttons no longer work. Downgrading to 1.6.3-1 fixes this issue.