I was trying to find /boot/grub/menu.lst OR /boot/grub/device.map as usual on Ubuntu Desktop or other versions to change the GRUB selection, but there is no file munu.lst or device.map in the grub directory. Where can I find GRUB's configuration file? to modify the grub selection
Ubuntu – How to remove GRUB selection
10.10grub2server
Related Solutions
Recent releases of Ubuntu have migrated to GRUB2. From the wiki:
Configuring GRUB 2
Important note: Configuration changes are normally made to /etc/default/grub and to the custom files located in /etc/grub.d. The /boot/grub/grub.cfg file should not be edited by the user; changes to this file are made by configuration scripts. After editing /etc/default/grub, you need to run sudo update-grub for your changes to take effect on the next boot.
Re-install Grub
sudo grub-install path/to/root/disk
Grub auto-detects operative systems during installation. I think it will also detect outside the disk you install it on, Like if you have a Live USB plugged that is not the booted system it will include it too.
I have mine in /dev/sda
sudo grub-install /dev/sda
Open Disks app and look for the partition that shows (Bootable):
Best Answer
The file you need is
/etc/default/gruband runsudo update-grubafter you've made your changes.