Reference: https://www.benburwell.com/posts/reset-forgotten-password-on-luks-encrypted-ubuntu/
Commands
- Shift to get to Grub
- Edit normal mode startup ( press e)
- Add to line with 'linux' init=/bin/bash
- F10
- Wait until initramfs appears
- cryptsetup luksOpen /dev/sda5
- mount -o rw /dev/massper/mint--vg-root /root
- chroot /root passwd
- chroot /root passwd youruser