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UPDATE: I successfully dual booted Linux! and then I messed up... (lemmy.ca)
submitted 1 year ago* (last edited 1 year ago) by otter@lemmy.ca to c/linux@lemmy.ml
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Update from this post from the other day: What to know before Dual Booting Windows + Linux?

TLDR: I got it working, started learning, tried to fix a grub issue and borked the whole system.

So after considering all the advice, I went and disabled/prepped/backed up, and started the process. I managed to get Fedora KDE installed on another partition and everything was looking ok. I installed some programs, started learning for a few hours, but there was one small issue. The grub configuration from the video didn't really work. Windows wasn't booting by default, and when I tried to do the GRUB_SAVEDEFAULT=true to have it boot the last OS, it also didn't work. When booting windows, a message would flash by saying '/EFI/fedora/grubenv' not found.

Looking more into it, the video says to use sudo grub2-mkconfig -o boot/efi/EFI/fedora/grub.cfg but I think the correct one now is grub2-mkconfig -o /boot/grub2/grub.cfg? I found this thread, but I couldn't run the first command because it gave a conflict error, and I think there were two versions of grub2 installed?

So anyways, I tried running the setup again, thought it was ok and did a reboot to test... and got hit with a black screen with minimal BASH like line editing is supported.

At this point I'm a little worried and lost, thinking maybe I wasn't ready to try this, and trying to get it back the way it was. I found this guide, but I get stuck trying to mount the EFI partition.

Any tips on where to go from here? Right now I plugged in the USB I used earlier, booted Fedora from it, and opened the terminal. Past that I'm a bit lost on how to fix grub.

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[–] otter@lemmy.ca 5 points 1 year ago* (last edited 1 year ago) (1 children)

More specific questions might be better than my mess above:

The guide I mentioned above seems to be the guide a few other forums reference. Is there a boot repair tool for Fedora KDE Plasma?

Alternatively, I am able to make it to the last step of the regular guide, where I need to run

sudo grub-install --boot-directory=/mnt/boot --bootloader-id=ubuntu --target=x86_64-efi --efi-directory=/mnt/boot/efi

I get a sudo: grub-install: command not found message. Since I'm on Fedora and not Ubuntu, what would be the correct command for me, assuming that's the reason. I didn't think it would work, but I tried just swapping 'fedora' for 'ubuntu' and got the same error

edit: Got a little further by using grub2 instead: sudo grub2-install --boot-directory=/mnt/boot --bootloader-id=ubuntu --target=x86_64-efi --efi-directory=/mnt/boot/efi, but got a new error:

grub2-install: error: /usr/lib/grub/x86_64-efi/modinfo.sh doesn't exist

edit: Got a little further by running sudo dnf install grub2-efi-x64-modules. Now when I run that command, error is

grub2-install: error: this utility cannot be used for EFI platforms because it does not support UEFI Secure Boot.

secure boot is definitely off, so I'm stuck again

[–] cytye@lemmy.wtf 3 points 1 year ago

Did you try: sudo update-grub