Reset the root password - x360Recover

https://help.axcient.com/x360recover-faqs-passwords-and-networks/115013610527-x360Recover-How-to-reset-the-root-password 

 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 / 

 passwd root 

 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: 

 rm /var/lib/mongodb/mongod.lock systemctl start asyncreboot 

 8. The system will reboot again and after that reboot, everything should start properly.