Just updated to Zorin OS 16 from version 12 that was dual-boot installed with Windows 10. I had deleted the Zorin 12 partition and installed 16 onto it like it showed in the guide, but now I'm assuming GRUB won't see my Win10 install because I don't even get a selection window it just instantly boot…

Yes to 64 bit Yes to using Legacy Boot Turns out it was all due to Fast Boot being enabled, and then when I fixed that GRUB didn't update so I just had to reinstall Zorin 16 again, which then updated GRUB to see Windows 10. Was able to get in and get access to all my stuff from there.

Mikeart September 2, 2023, 4:29pm 4

Try here I'm no expert good luck.Boot problems.

Upgraded to 16 from 12 and GRUB no longer sees my Win10 install