If you’ve lost your Linux password, here’s a simple Grub way to recover it. For more detail, check the video attached to this post.
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Reboot your machine and press E at the GRUB boot menu.
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Find the line that starts with linux, change ro to rw, and add init=/bin/bash at the end.
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Press Ctrl + X to boot.
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In the shell, run passwd root and set a new root password.
(same procedure to reset your user password) -
Press Ctrl + Alt + Del to reboot.
That’s it.