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Old 03-21-2019, 11:36 AM   #1
Registered: Sep 2018
Posts: 72

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Debian no longer showing in boot menu

Hello, for some reason Debian doesn't get shown in the BIOS or boot menus. It does show in grub, and I can boot into it, but it disappeared from the boot menu and BIOS. How could I fix this?
Old 03-21-2019, 12:20 PM   #2
Registered: Apr 2009
Distribution: Debian testing
Posts: 971

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This sounds like a guessing game.

1- I'm guessing, this is a UEFI setup.
2- I'm guessing, since you posted from some Ubuntu derivative, it shows up in Ubuntu grub menu.

If my guesses are correct, boot into Debian, run command: fdisk -l to find which device it's boot directory is in, if it don't have it's own /boot partition it will be in the root of Debian. So if Debian root is for example: /dev/sda4, run command: grub-install /dev/sda4 as root or sudo from within Debian.
That should rebuild the boot files in the EFI system partition and add it to the firmware menu.
That would be the quick easy way, from Ubuntu or Debian you can have a look in /boot/efi/EFI to see if there is a Debian directory, in which you could take the long route and try adding Debian to the menu with efibootmgr commands.

If I guessed wrong, please post relevant information.

Last edited by Brains; 03-21-2019 at 12:22 PM.
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