Dual Booting Debian with win10

[debianer98]

Hi!
I need a little help. I installed Debian 10 to my HP laptop. It was fine working except that I needed the Windows to boot first, so I went on, and made some modifications after tutorials, but it didn't work, what's more, my Windows disappeared from the Grub menu, so I'm not able to log into it. Can someone help me bringing back my Windows boot-option? Thanks in advance!

[Head_on_a_Stick]

I went on, and made some modifications after tutorials, but it didn't work, what's more, my Windows disappeared from the Grub menu, so I'm not able to log into it.

Which modifications did you make, exactly? Try running update-grub (as root) to regenerate the configuration file.

[debianer98]

The thing is that I can't remember, and I don't have the browser history for the tutorials (I have never tried dual-booting systems, so I might misunderstood something very badly), and after updating grub I get the same results as before.

[Dai_trying]

If I had to throw a guess at this I would say you might have changed the system from UEFI to Legacy (or the other way round) as you cannot find the Windows OS from debian, If this sounds familiar you could try changing back to the other one and you will likely boot only into Windows, but at that point it would be possible to use a Live-cd to access the Debian installation and from there you could install the correct grub version which should fix your problem. But only if my guess is correct of course.

[kedaha]

You might try this quick, inelegant "method":

Code: Select all

# apt remove --purge grub-common grub-pc grub-pc-bin grub2-common os-prober

Followed by

Code: Select all

# apt install grub-pc grub-pc-bin grub2-common os-prober

And the Windows entry should come back.

[milomak]

The thing is that I can't remember, and I don't have the browser history for the tutorials (I have never tried dual-booting systems, so I might misunderstood something very badly), and after updating grub I get the same results as before.

did you use the terminal?

if so post the output of history here