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I've first installed Windows 10 and afterwards the latest Xubuntu version. If I boot now it directly boots Xubuntu. Grub won't be loaded. I also changed the boot style in grub from hidden to menu without success. Then I tried to press the esc key during startup to force the grub boot menu without success either. So it looks like grub isn't loaded at all.

When I change the boot order (in UEFI) to the hard disk where windows 10 is installed, it boots without any problems. I tried out the tool boot-repair. When I chose apply it said that I need to enable legacy mode for CRM. I checked in the UEFI screen and it's already activated. The error I get from boot-repair is LegacyWindows detected.

When installing Xubuntu I created an efi partition as this was required. I see this partition in my fstab. How do I get dual-boot working without having to go into Uefi-Bios to select the disk to boot?

Daniel
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1 Answers1

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You can't have dual boot between lagacy and uefi systems.

The easiest way to fix that would be to convert Windows boot from Legacy to UEFI mode. There's a step-by-step I found on that how to do that: https://www.maketecheasier.com/convert-legacy-bios-uefi-windows10/

If you want to reinstall windows from fresh iso, you will need to change partition table type using other tools. There's a very good one I've actually used several times before called gdisk: https://www.explorelinux.com/convert-disk-mbr-to-gpt-on-linux/

Before you start - back up your data. If something goes wrong, you'll probably loose everything on that drive.

After you're done run Ubuntua and run grub os-prober to find Windows (in case it was not found automatically). Alternativelly you can install rEFInd boot manager - I find it to be much better than grub for dual-boot efi systems.

Piotr X
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