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Installing Windows 10 UEFI with Ubuntu already installed

py flag

I already have Ubuntu 20.04 installed and working fine. I was already dual booting Win 10 with GRUB, but something happened to my Windows install, I had to reinstall Windows which worked fine but GRUB WILLNOT find my Win 10 boot partition. (EUFI install = 4 partitions) Anyone know how to fix this. Both systems are on their own HDD in my system.

Will avatar
id flag
Welcome to AU. Did you update grub after installing Windows? Would be useful to state exactly how you reinstalled Windows.
Mike Small avatar
py flag
Thanks for replying,
Mike Small avatar
py flag
Yes, thanks, I know how to update grub, my problem is with Grub NOT finding my UEFI installed windows. IF I install Win 10 Legacy it finds it perfectly. Since UEFI Windows uses 4 partitions even I don't know which one has the boot record. I have resorted to using Win10 Legacy since that works, just wondered if anyone knows why OS-PROBER can't find it. thx
Mike Small avatar
py flag
My bad, my Ubuntu is Ver 22.04.1LTS
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