How we can hack Linux with no booter password?

Answer 1

First you have to enter run level 1 by appending "1" or "single" or "init=/bin/bash" line at the kernel parameter line which you can access from the grub boot loader.(You have to select your OS and press "e" or something to edit the boot parameters. This can only be achieved if the grub is not password protected)

Then, issue the usual password for password reset