Hi, I had been affected by the same problem, but the bug doesn't lies in UU.
What is the output of the "users" and "loginctl" commands in a terminal ? What is your display manager ? Maybe you are affected by this SDDM bug: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=878956 Greetings, 2018-03-06 10:33 UTC+01:00, Colin 't Hart <colinth...@gmail.com>: > Package: unattended-upgrades > Version: 0.93.1+nmu1 > Severity: normal > > I have > Unattended-Upgrade::Automatic-Reboot-WithUsers "false" > in my /etc/apt/apt.conf.d/50unattended-upgrades > > I have noticed several times now when I arrive at my office in the morning > that my machine has rebooted even though I was logged in when I left the > evening before. I use a standard install of XFCE with its screen locker and > my screen was locked when I left.