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GRUB and system boot order not detecting Windows

es flag

Recently, I tried to dual boot Ubuntu alongside windows 10. I didn't have free space on my windows partition, i.e, C:, so, made a partition in the D: drive and installed Ubuntu on it. I ran into several problems, like after turning on my laptop, my screen continuously showed No Boot device found. Hence, I tried to go into boot order settings by pressing F9 and my system was able to boot into Ubuntu by BOOT through EFI - - "very long weird paragraph" - ubuntu - <grubX64.efi>. I have followed countless articles but none have solved the issue for me. after going into GrubxX64.efi and pressing esc, shows the GRUB menu, but it only has the option to boot into Ubuntu. os-prober doesn't detect the windows partition, and adding a custom boot option for windows UUID also doesn't work. What should I do?

oldfred avatar
cn flag
Are boot systems installed in same boot mode or both UEFi or both BIOS? Vendors are required to install Windows in UEFI boot mode since Windows 8 in 2012. Grub can only boot other installs in same boot mode. And is Windows fast start up off. If hibernated then os-prober/grub cannot see Windows. https://askubuntu.com/questions/843153/unable-to-mount-windows-10-partition-it-is-in-an-unsafe-state & https://askubuntu.com/questions/145902/unable-to-mount-windows-ntfs-filesystem-due-to-hibernation
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