Home » GRUB starts in command line after reboot

GRUB starts in command line after reboot

Solutons:


The boot process can’t find the root partition (the part of the disk, that contains the information for starting up the system), so you have to specify its location yourself.

I think you have to look at something like this article: how-rescue-non-booting-grub-2-linux

short summary:

in the grub rescue> command line type

ls

… to list all available devices.
Then you have to go through each, type something like (depends what is shown by the ls command):

ls (hd0,1)/
ls (hd0,2)/ 

… and so on, until you find:

(hd0,1)/boot/grub   OR (hd0,1)/grub

… or, in case of “UEFI”, it look something like:

(hd0,1)/efi/boot/grub OR (hd0,1)/efi/grub

Now you have to set the boot parameters accordingly – just type the following (with the correct numbers for your case) and after each line press return:

set prefix=(hd0,1)/grub

… or (if grub is in a sub-directory):

set prefix=(hd0,1)/boot/grub

Then continue with

set root=(hd0,1)
insmod linux
insmod normal
normal

Now it should boot:

boot

Go to the commandline (e.g. start a “terminal”) now, and execute:

sudo update-grub

… this should correct the missing information and it should boot next time.

If NOT – you have to go through the steps again an might have to repair or install grub again:
Please look at the “Boot-Repair”-tool from this article: https://help.ubuntu.com/community/Boot-Repair (I had positive experiences with it, when previous steps wouldn’t survive the reboot)

This is some funny thing happening to many PC dual booting with Windows 10. Happened to me and friends recently. Please note that I don’t know why, I can only speculate this depends on some Windows 10 updates. As someone said, indeed this is due to the boot process not finding the root partition for some reason, so GRUB asks you to tell him where it is via CLI.

this is what I got

Anyway thanks for asking this question, I found it trying to fix my problem and I created this account just to answer this. The fix is super easy :

  • go to BIOS/UEFI
  • check the boot partitions: are there ok or too many? do you recognize all of them? Remove the ones that are not needed.
  • reset the boot order to default
  • restart, you should see the usual GRUB menu

You can boot your linux system through Super Grub2 disk, Download the iso from here and create a bootable USB

After successfully booting kali linux , reinstall grub-efi as follows :

grub-install --target=x86_64-efi --efi-directory=/boot/efi --bootloader-id=debian --recheck --debug /dev/sda
update-grub

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