Grub Menu: Change the Default Boot OS

OS Lubuntu v18.10 (64-bit)
System Gateway NV78

1. Find the string for the OS you want to set as the default.

# grep menuentry /boot/grub/grub.cfg

2. Highlight the string and copy it to the clipboard. (include the quotes.)

e.g. "Windows 10 (loader) (on /dev/sda1)"

3. Edit /etc/default/grub

# sudo vi /etc/default/grub

4. Change the value of GRUB_DEFAULT from 0 to the OS string you copied from /boot/grub/grub.cfg, then save the file.

5. Regenerate the Grub menu, /boot/grub/grub.cfg, by running the following command:

# sudo update-grub

6. Reboot the computer to verify the expected OS is the default.

Reference:

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