Reboot and shutdown fail with a kernel panic and I have to long press the power button in order to reboot. I will attempt to report this bug with the “ubuntu-bug linux” terminal command. Bug Description: Upgraded to Kernel 4.4.0-108-generic today (1/9/18) on my Dell XPX-13 (model 9360). Reboot, shutdown and reboot fail with kernel panic. I have a long press power button to reboot and suspend also fails.”]
Source: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1742330