I just got over with installing Ubuntu 13.04 on my Asus laptop from a USB stick. After the installation finished and the computer restarted, it started up with a GRUB: invalid arch independent ELF magic error. I looked around on Google to find out a solution and found Cadoc's thread GRUB: “invalid arch independent ELF magic” after 11.10 install on Macbook Pro 5,5 and followed the solution up to the line
sudo grub-install --root-directory=/mnt /dev/sda
When I typed that command, I got
/usr/sbin/grub-bios-setup: Not found.
and I couldn't find any solution for that after some searching on Google. So what do I have to do to fix that and get thing going fine?