How did you changed environment to your mount points? You can choose partitions only when using the partition chooser.
Did you save the environment setup? This may be the reason for crashing on startup. Try to delete /etc/grub-customizer/grub.cfg (sudo rm).
How did you changed environment to your mount points? You can choose partitions only when using the partition chooser.
Did you save the environment setup? This may be the reason for crashing on startup. Try to delete /etc/grub- customizer/ grub.cfg (sudo rm).