I would like to have two Ubuntu-OS on a virtual machine and to test grub boot loader on this system.
I can change the order from one Ubuntu to another, but it does not work on reverse case. I am changing the grub file(/etc/default/grub) but there is no effect on grub order.
I have already tried to fix it with help of the program "Grub Customizer", but it did not work as well.
Grub Customizer View
Content of Grub file on Ubuntu
Content of Grub file on Ubuntu 18.04.5 LTS(18.04)
Grub selection view
