Short guide to dual booting where Windows gets installed as Legacy, for whatever reason, instead of UEFI. I was having issues dual booting from my Z390 Phantom Gaming-ITX/ac the os-prober command would never pick-up Windows and put it into grub for me to boot from. Eventually I figured out that Windows was being installed as Legacy instead of UEFI. Even setting the BIOS to use UEFI only, Windows was getting installed as Legacy for some reason.
- Z390 Phantom Gaming-ITX/ac
- Linux Mint 20.3 on 256GB M.2 SSD
- Windows 10 on 128GB SATA SSD
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Unplug SATA drive.
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Insert Mint Flash Drive
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Hit F11 to boot from Flash Drive
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Install MINT on the M.2 drive.
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Do all updates and what not.
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Shut Down
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Insert Win10 Flash Drive
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Hit F11 to boot from Flash Drive
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Install Win10 on SATA SSD
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Windows will ask to reboot various times or just reboot.
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Hit F11 each reboot to select the SATA drive to boot from.
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Reboot to Win10 to do updates and install drivers.
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Shut Down
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Set BIOS to default boot from
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Install ReFind
sudo add-apt-repository ppa:rodsmith/refind apt update apt install refind -
Edit the
refind.confand uncomment one line:sudo nano /boot/efi/EFI/refind/refind.conf # uncomment and set: uefi_deep_legacy_scan 1 -
Other config options are here: https://www.rodsbooks.com/refind/configfile.html#table1
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Reboot
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This will show all possible bootable options.
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You should see both your Mint and Windows options.
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You may remove extra options with the
-key. -
There are theming options if you do not like the default theme: https://www.rodsbooks.com/refind/themes.html
I used the rEFInd theme Regular dark mode, screen shot below; hosted on github here: https://github.com/bobafetthotmail/refind-theme-regular
