Dual boot: Linux Boot option disappear

Question

So I installed Pop!_OS while having Windows installed everything was working great.

The way I was choosing between the operating systems was by pressing F12 and that opens a boot menu for my laptop so there is no Grub involved I think.

The issue is that after I changed the boot order from the bios (I moved Windows 10 first) the Linux option disappear from the boot menu. Even if I tried to move the Linux back first it still won't show up :/.

So is there a way to fix this issue, other than reinstalling the Linux distribution?

Edit 1: The way I updated the boot order:

1. Opened the bios
2. Went to this tab
3. Swapped Windows Boot Loader with the Linux one (it doesn't show up anymore)
4. Save and Restart
5. Test that by default it boots in windows
6. Noticed the issue (there is no Linux option anymore)

PS. Sorry for the image, I have no idea if it is possible to take a screenshot in bios :)

Answer 1

You have to create a livedisk and then live boot. In the live environment, run these commands:

For SATA drives

sudo mount /dev/sda3 /mnt sudo mount /dev/sda1 /mnt/boot/efi for i in /dev /dev/pts /proc /sys /run; do sudo mount -B $i /mnt$i; done sudo cp -n /etc/resolv.conf /mnt/etc/ sudo chroot /mnt apt install --reinstall linux-generic linux-headers-generic update-initramfs -c -k all exit sudo bootctl --path=/mnt/boot/efi install 

For NVME drives

sudo mount /dev/nvme0n1p3 /mnt sudo mount /dev/nvme0n1p1 /mnt/boot/efi for i in /dev /dev/pts /proc /sys /run; do sudo mount -B $i /mnt$i; done sudo cp -n /etc/resolv.conf /mnt/etc/ sudo chroot /mnt apt install --reinstall linux-generic linux-headers-generic update-initramfs -c -k all exit sudo bootctl --path=/mnt/boot/efi install 

In this code, sda1 is the /boot partition and sda3 is the /root partition which might be different for your installation. Run lsblk to make sure you are choosing the right hard drive and partitions.

All the details can be found in this link. https://support.system76.com/articles/bootloader/

follow the systemd-boot section of this link as I think you do not have GRUB.