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On gurb menu, press "e" to enter edit mode
Go to the line starting with "linux", and add " init=/bin/bash" to the end of the line.
Ctrl-x to boot, and you will see the # prompt
Type "mount -o remount rw /" to remount the root file system as writable.
Use command "passwd" to change the root password or any user's password
Reboot by "reboot" command