is the windows installation also uefi? (dual booting a bios install of
windows from uefi grub is not possible, grub and windows have to match
for that to work)
what is in /etc/default/grub and /boot/grub/grub.cfg?
did you run update-grub? what was its output?
** Changed in: grub2 (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1898022
Title:
grub upgrade 18.04->20.04 loses dual-boot to W10
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