My root password has been changed, how can i enter into the
system without root password?

Answer Posted / rehan

Boot the system, at grub prompt, press e and come to edit
the kernel line with one space and type there 1 for single
user mode and press Enter and press 'b' for boot the system
then ur system will be in single user mod then type there
# passwd and press enter then it'll ask u for new root
password. After giving the password type 'exit' for reboot
the PC.

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