I can't make a GRUB config

A few weeks ago, I accidentally updated my kernel, and out of nowhere I got these strange pixelated lines all over my screen. So, I decided to try and use the linux-lts kernel. But, when I tried to chroot into my root directory run grub-mkconfig /dev/sda I got /usr/bin/grub-probe: error: cannot find a device for / (is /dev mounted?) I am running 32 bit Void.