Just get rid of the GRUB passwords by making all lines of /etc/grub.d/01_PASSWORD start with the '#' character (editing the file requires administrative privileges). Even GRUB developers write that this password is no security (unless the system is a kiosk): https://www.gnu.org/software/grub/manual/grub.html#Security

If you wish to reconfigure GRUB (like proposed at the update):
$ sudo dpkg-reconfigure grub-pc

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