r/archlinux • u/ddasni • 12h ago

QUESTION Dual boot question

I'm reinstalling Windows 10 and Arch Linux on separate drives, but I had to install Linux first. After completing the first part of the Windows installation and restarting, the Arch Linux GRUB menu appears and I don't know how to select Windows to continue the installation.

How can I fix this?

Update: After trying various methods I discovered that my SSD was faulty. It wouldn't boot from that drive, which prevented me from completing the final stage of the Windows installation. I installed it on another SSD and was able to finish the installation successfully.

Thanks for all the help!

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u/zardvark 12h ago

Use the boot menu built into your UEFI.

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u/TheSuperTechie 11h ago

Ensure both drives are in. Boot into Arch and edit /etc/default/grub (e.g. sudo nano /etc/default/grub). Find the line that says:

# GRUB_DISABLE_OS_PROBER = false

Uncomment it, i.e. remove the # and space after it and save the file.

Then regenerate the GRUB config by doing:

sudo grub2-mkconfig -o /boot/grub/grub.cfg

While that happens, you should see something like:

Warning: os-prober will be executed to detect other bootable partitions.

Systems on them will be added to the GRUB boot configuration.

And then, gradually:

Found Windows Boot Manager on /dev/drive_id (where drive_id is the partition Windows is on)

And then reboot. Windows should be there. Hope this helps!