I accidentally removed the BIOS boot option for Linux, but fortunately, I found this very detailed guide on how to restore the GRUB bootloader for Linux.
I believe this will work in most cases, even after installing the Windows bootloader, which usually overwrites Linux boot settings.
Below are some notes after I did this (more details in the link above):
Create an Ubuntu boot disk. The download is usually fast, but the slow part is writing to the boot USB (which took 20 minutes for me). See how to create a boot disk (on Windows) here.
Find the Linux partition:
sudo fdisk -l
sudo blkid
Check for EFI boot:
sudo fdisk -l
(look for a partition with the type 'EFI System').Mount your partition:
sudo mount /dev/sdXY /mnt
This is needed tochroot
into your Linux mount later.Bind mount necessary directories:
for i in /sys /proc /run /dev; do sudo mount --rbind "$i" "/mnt$i"; done
If you have EFI boot:
sudo mount /dev/sdXY /mnt/boot/efi
Chroot:
sudo chroot /mnt
Update GRUB:
update-grub
After this step, you may restart if it's fixed. Otherwise, continue to step 9.Reinstall GRUB if not fixed:
grub-install /dev/sda
(to detect and add Windows to the GRUB menu).
update-grubCheck if the EFI UUID is correct, and update it if needed:
blkid | grep -i efi
grep -i efi /etc/fstabFinish:
exit
sudo reboot
There are many steps, but the detailed instructions make them easy to follow. It's easy to Google any terms you don't understand, so don't worry.
I hope this helps fix your Linux system!
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