Grub-Customizer made Windows 7 disappear from Grub2

Question

I am running dual-boot Ubuntu 12.04/Windows7. I wanted to change the boot order in Grub2 to have Windows on top of the list. I installed Grub-Customizer on Ubuntu 12.04 using the following terminal commands copied from another post:

sudo add-apt-repository ppa:adabbas/1stppa
sudo apt-get update
sudo apt-get install grub-customizer

After installing, I launched Grub-Customizer from Dash Home. Windows 7 does not appear in the list. I closed the program and was prompted to save the current settings. Upon rebooting, Windows did not appear in the Grub2 list.

I went back into Grub-Customizer and clicked the "Revert" button but still no Windows 7.

Does anyone know how I can fix this?

Answer 1

Boot-Repair can undo the settings generated by GRUB-Customizer.

Run Boot-Repair --> Advanced Options -> GRUB options tab --> tick "Purge GRUB and reinstall it" --> Apply

Indicate the URL that will appear if any issue.

Answer 2

You can run

sudo update-grub

to generate a new grub config file and let grub detect all the OS installed on your system.

Anyway, if you want to change the deafult entry in GRUB, you can edit the /etc/default/grub file. The value of GRUB_DEFAULT indicates the default boot item in the grub menu. This settings takes either a string or a numeric value:

String: menuentry name

You can give to it the entry name in this way:

GRUB_DEFAULT="Menu entry"

You can take the entry name from this file /boot/grub/grub.cfg. In it you will find some lines starting with "menuentry", the string between the " " indicates the entry name.

Numeric value: entry number

You can also give an "entry number" instead of the entry name to GRUB_DEFAULT. For example, if you want the second entry to be the default, just edit like this:

GRUB_DEFAULT=2

Here too, you can see the entry number inside the file /boot/grub/grub.cfg counting the "menuentry" lines.

Don't forget to run a sudo update-grub after the modifications in order to make changes to GRUB_DEFAULT into the real grub config.