Dual boot menu not showing after installing Garuda Linux KDE

[petsam]

You have to re-install grub properly, using a Live ISO and chroot.
For how to chroot, read here

Grub fails after update

chroot steps in garuda linux from live garuda usb sudo mkdir /mnt sudo mount /dev/sdxy /mnt sudo garuda-chroot /mnt/@ now you should be chrooted in garuda if the system is installed in legacy bios then do the following in the chroot grub-install /dev/sda if its installed on efi first mount the efi partition ie fat32 partition from inside the chroot mount /dev/sdxy /boot/efi then grub-install --target=x86_64-efi --efi-directory=/boot/efi --bootloader-id=garuda --recheck then updat…

For grub problem, here

[SOLVED] Can't Load kernel on Snapshoot

Perhaps reinstall sudo pacman -S grub-btrfs grub os-prober-garuda sudo grub-install sudo mkinitcpio -P sudo update-grub