So. I installed Debian on my asus laptop, resized the windows partition, and installed Debian 11(stable). windows was automatically add to grub and everything was good. I apt update && apt upgrade, and when I went to reboot, windows boot was gone. All the partitions look like they're still there.

  1. Disk /dev/mmcblk0: 116.48 GiB, 125069950976 bytes, 244277248 sectors
  2. Units: sectors of 1 * 512 = 512 bytes
  3. Sector size (logical/physical): 512 bytes / 512 bytes
  4. I/O size (minimum/optimal): 512 bytes / 512 bytes
  5. Disklabel type: gpt
  6. Disk identifier: 32BD2B1E-DBD1-4782-93F4-A9EA7A7AC78E
  • Device Start End Sectors Size Type
  • /dev/mmcblk0p1 157390848 158439423 1048576 512M EFI System
  • /dev/mmcblk0p2 534528 567295 32768 16M Microsoft reserved
  • /dev/mmcblk0p3 567296 157388804 156821509 74.8G Microsoft basic data
  • /dev/mmcblk0p4 158439424 240431103 81991680 39.1G Linux filesystem
  • /dev/mmcblk0p5 242432000 243865599 1433600 700M BIOS boot
  • /dev/mmcblk0p6 243865600 244275199 409600 200M Windows recovery environment
  • /dev/mmcblk0p7 240431104 242431999 2000896 977M Linux swap

but I can't seem to get windows to boot. It's not an option in the bios either. shows 2 debian options, which is weird. anyways, I've looked all over qnd haven't found anything that would even pointme in the right direction. please helpo. thanks.

  • You should always have a Windows boot option in UEFI boot menu. But you show both ESP - efi system partition for UEFI boot and bios_grub (BIOS boot) for BIOS boot on gpt drive. Those are not compatible. All systems should be UEFI. Grub also removing os-prober for security reason for now. Please copy & paste the pastebin link to the Bootinfo summary report ( do not post report), do not run the auto fix till reviewed.Lets see details, use ppa version with your USB installer (2nd option) or any working install, not Boot-Repair ISO help.ubuntu.com/community/Boot-Repair
    – oldfred
    Jan 13, 2022 at 3:33
  • pastebin.com/GDRKrrs3 and I'm working on finding the ppa for boot-repair.
    – caspah
    Jan 13, 2022 at 5:14
  • I dunno if you got my last post, but here, pastebin.com/GDRKrrs3. IT's set to burn in an hour. lemme know if you can't see it, plus I'mhaving mad issues installed boot-repair. I'm thinking it because its designed for unbuntu? I dunno. Imma keep trying,
    – caspah
    Jan 13, 2022 at 6:23
  • I cannot look at paste. Never seen the burn after looking once. We all are volunteers and others should also look at it and see something I miss.
    – oldfred
    Jan 13, 2022 at 12:54
  • pastebin.com/PG9U4ML5
    – caspah
    Jan 15, 2022 at 13:59

1 Answer 1


In a recent version of Grub in debian the defaults were changed.

By default, grub's setup scripts no longer scan for other OSen.

This behaviour was documented at https://wiki.debian.org/Grub :

When I upgraded from GRUB to GRUB2 I lost an entry to XP/WP7 , how can I recover the menu entry to boot there?

You have to install os-prober, make sure its enabled in GRUB2 configuration and sync GRUB2.

apt-get install os-prober

Then edit /etc/default/grub and make sure you have a line like


I had the same issue while updating a legacy system, and this worked for me.

  • so I tried that and nothing changed. I've been playing with different dist of linux starting with 18 floppys to install redhat and I deleted the windows partition on my parents $1500 computer, so I thought of myself as somewhat knowledgeable.. guess not. here's a boot repair report. anyways, please help. Pastebin.ubuntu.com/p/D3ysh4DzYF
    – caspah
    Jan 13, 2022 at 12:17
  • I don't have a ubuntu.com login and can't view that pastebin. Include the actual text in an edit of the actual question.
    – Shadur
    Jan 13, 2022 at 12:42
  • it's way to much to post here. try this. pastebin.com/h76nqwTS
    – caspah
    Jan 13, 2022 at 12:48

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