On February 14, 2020 2:18:58 PM UTC, Jeremy Jongepier <jeremy@autostatic.com> wrote:

On 14/02/2020 13:21, David Kastrup wrote:
I think there are some emergency SysReq key combinations.  No idea
whether they need some special enabling.  They bypass user space and
might be worth a try for getting a somewhat more regular shutdown.

Alt + SysReq + REISUB (aka "Reboot Even If System Utterly Broken")
should reboot the machine.

Best,

Jeremy