Suddenly windows is missing from bootmenu maybe after an update, or maybe after a sudden shutdown during windows boot process.

os-prober output:

/dev/sdb1@/EFI/Microsoft/Boot/bootmgfw.efi:Windows Boot Manager:Windows:efi
/dev/sdb3:Ubuntu 18.04.2 LTS (18.04):Ubuntu:linux

efibootmgr -v output:

BootCurrent: 0003
Timeout: 0 seconds
BootOrder: 0001,0008,0000,0007,0009
Boot0000* Windows Boot Manager  HD(1,GPT,93828d50-bca4-01d4-a842-c149525eea00,0x800,0x145000)/File(\EFI\Microsoft\Boot\bootmgfw.efi)WINDOWS.........x...B.C.D.O.B.J.E.C.T.=.{.9.d.e.a.8.6.2.c.-.5.c.d.d.-.4.e.7.0.-.a.c.c.1.-.f.3.2.b.3.4.4.d.}...3................
Boot0001* manjaro   HD(1,GPT,65c82838-e33c-4e92-9be0-c427de042756,0x800,0x145000)/File(\EFI\manjaro\grubx64.efi)
Boot0007* UEFI: WDC WD10SPZX-75Z10T1, Partition 1   HD(1,GPT,93828d50-bca4-01d4-a842-c149525eea00,0x800,0x145000)/File(EFI\boot\bootx64.efi)..BO
Boot0008* ubuntu    HD(1,GPT,93828d50-bca4-01d4-a842-c149525eea00,0x800,0x145000)/File(\EFI\ubuntu\shimx64.efi)
Boot0009* UEFI: Micron 1100 SATA 256GB, Partition 1 HD(1,GPT,65c82838-e33c-4e92-9be0-c427de042756,0x800,0x145000)/File(EFI\Microsoft\Boot\bootmgfw.efi)..BO

lsblk output:

sda      8:0    0 931.5G  0 disk 
├─sda1   8:1    0   650M  0 part 
├─sda2   8:2    0   651G  0 part 
└─sda3   8:3    0 279.9G  0 part /run/media/user/lincom
sdb      8:16   0 238.5G  0 disk 
├─sdb1   8:17   0   650M  0 part /boot/efi
├─sdb2   8:18   0  70.2G  0 part /run/media/user/6A5E35815E35475B
├─sdb3   8:19   0  27.9G  0 part /run/media/user/43f98f19-cd98-403a-96bd-6bac85
├─sdb4   8:20   0    51G  0 part /
├─sdb5   8:21   0  33.3G  0 part /run/media/user/vms
└─sdb6   8:22   0  55.5G  0 part /home

I used the following command to reinstall grub:

sudo grub-install --target=x86_64-efi --efi-directory=/boot/efi --bootloader-id=manjaro --recheck
sudo update-grub

But it still did not find the Windows (or the Ubuntu).

All the operating systems were installed in UEFI mode and using the same efi partition for boot.

~/# uname -r
~/$ grub-install --version
grub-install (GRUB) 2.04~19~manjaro

2 Answers 2


Actual Answer

Expanding on @Jahid response if you have updated grub recently and either your boot menu or entires of it have disappeared you will need to edit /etc/default/grub and add/edit one or more of the following lines:

If your boot menu is not showing


If other operating systems are missing (applies to Linux or Windows, same disk or another disk, HDD, SSD or NVMe).


Now VERY IMPORTANT make sure that after editing this file you run sudo update-grub for the changes to apply. Editing /etc/default/grub on it's own does nothing.

Additional Info

Some other commands you might find useful are listed in the question, lsblk will list disks and partitions, fdisk -l will give you more info (like which disk Windows is on), sudo os-prober will list all the additional operating systems that can be found (Linux and Windows but not the one you're currently running).

Files and folders that may be of interest if none of the above helps are as follows:


Grub Documentation (for reference), the "Writing your own configuration file" section lists options you can add in your /etc/default/grub file.


For some reason, the new version of grub does not probe for other operating systems by default anymore. You need to add:


in /etc/default/grub


Forgot to mention, you need to update-grub to apply this change.

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