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GRUB doesn't detect Windows 10 alongside Ubuntu 20.04.2

cn flag

I have installed Ubuntu 20.04.2 alongside windows 10. But the GRUB isn't recognizing Windows 10.

I have tried:

sudo os-prober

sudo update-grub

And I've also tried boot-repair but after doing recommended scan, it's throwing this error:

LegacyWindows detected. Please enable BIOS-compatibility/CSM/Legacy mode in your UEFI firmware, and use this software from a live-CD (or live-USB)

I've also tried the first answer to this post but when I used bootrec /fixboot I encountered element not found error in Windows recovery CMD (But I did all the instructions despite the error/warning).

Still after several hours, my GRUB is not recognizing the windows 10.

Thanks in advance :)

oldfred avatar
cn flag
It says Windows is in Legacy/BIOS/CSM boot mode. Did you install Ubuntu in UEFI boot mode. Most systems are UEFI since Microsoft has required vendors to install Windows in UEFI boot mode since 2012. Lets see details, use ppa version with your live installer (2nd option) or any working install, not Boot-Repair ISO: Please copy & paste the pastebin link to the Boot-info summary report ( do not post report), do not run the auto fix till reviewed. https://help.ubuntu.com/community/Boot-Repair
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