I have a server in Vulter.com need to setup a password after restore it -- 3

Hello I have a server in [login to view URL] restored from old snapshot after restoring it I can not access to FTP files because I dont have the passowrd it shows a note (Unknown, set in snapshot.) the support system send a guide for me: Ubuntu Click [View Console] to access the console and click the send CTRL+ALT+DEL button on the top right. Alternatively, you can also click [RESTART] to restart the server. As soon as the boot process starts, press ESC to bring up the GRUB boot prompt. You may need to turn the system off from the control panel and then back on to reach the GRUB boot prompt. You will see a GRUB boot prompt - press E to edit the first boot option. (If you do not see the GRUB prompt, you may need to press any key to bring it up before the machine boots) Find the kernel line (it starts with linux /boot/) and add init=/bin/bash at the end of the line. Press CTRL+X or F10 to boot. The system will boot and you will see the root prompt. Type mount -o remount,rw / and then passwd to change the root password and then reboot again. I need someone to help me with this and make sure that server will work again with no problems, thanks