Had to reboot a Debian based system this weekend to apply kernel patches
but it would not reboot. All commands (poweroff -p, reboot, init 6)
would return with this error message or similar:

Failed to start reboot.target: Transaction is destructive.
See system logs and 'systemctl status reboot.target' for details.

Systemctl produced no useful details whatsoever and only reiterated the
command line error in more verbosity. The only recourse was to power
cycle the system after a umount of the major filesystems.

Thank you Devuan for providing a stable and re-bootable system. The bar
continues to be lowered.