I installed Kali Linux next to Windows in dual boot mode, then I updated Kali. After rebooting my laptop to return to windows, it does not appear as an option in the grub boot loader anymore, even though I still can see Windows data when I go back to kali.
How do I restore Windows as a boot option?
edited: seems i am right, kali grub updated on 2022-06-16 to v2.06.
i searched on https://pkg.kali.org/pkg/grub2, it shows:
[2022-06-16] grub2 2.06-3kali1 migrated to kali-rolling (Sophie Brun)
[2022-06-15] Accepted grub2 2.06-3kali1 (source) into kali-dev (Sophie Brun)
[2021-08-10] grub2 2.04-20kali1 migrated to kali-rolling (Sophie Brun)
[2021-08-10] Accepted grub2 2.04-20kali1 (source) into kali-dev (Sophie Brun)
Here is the original answer:
What's your grub version? i guess should be >= 2.06, because after grub 2.06 version, os-prober is disabled by default.
To have grub-mkconfig search for other installed systems and automatically add them to the menu, install the os-prober (maybe kali already intalled) package and mount the partitions from which the other systems boot. Then re-run grub-mkconfig. If you get the following output: Warning: os-prober will not be executed to detect other bootable partitions, then edit /etc/default/grub and add/uncomment:
GRUB_DISABLE_OS_PROBER=false
Then try again.
Also, there a setting in Windows 8/10 called "Hiberboot", "Hybrid Boot" or "Fast Boot" can prevent the Windows partition from being mounted, so grub-mkconfig will not find a Windows install. Disabling Hiberboot in Windows will allow it to be added to the GRUB menu.
links:
https://lists.ubuntu.com/archives/ubuntu-devel/2021-December/041769.html
https://wiki.archlinux.org/title/GRUB#Detecting_other_operating_systems
