Disclaimer: This is dangerous as it might cause a corrupt file system.
These instructions should be used with the guidance of Axcient's Tech Support.
1. Reboot the system and wait for the Grub boot menu to appear. Press the <Down> and then <Up> cursor keys to interrupt the automatic boot countdown.
2. Enter E on the top line.
3. Scroll down to the line that starts with "linux /boot", go to the end of that line, and then add "init=/bin/bash" without the quotes
4. Enter F10 to boot.
5. When you arrive at the command prompt, type
mount -o remount,rw /
6. Enter your new root password twice:
mount -o remount,ro /
7. At this point, you can try 'reboot' or 'shutdown -r now' but if those fail, the power button is the only option.
After the system comes back, log in as root and:
systemctl start asyncreboot
8. The system will reboot again and after that reboot, everything should start properly.