I did not see anything wrong in /etc/default/grub, but i had set the GRUB_DEFAULT=auto and had modified the /etc/grub.d/40_custom
After update GRUB_DEFAULT was 0 again.
I did not see anything wrong in /etc/default/grub, but i had set the GRUB_DEFAULT=auto and had modified the /etc/grub. d/40_custom
After update GRUB_DEFAULT was 0 again.