LL 3.0 installs fine but won't boot looking for file name

[Mel_B]

The exact error message was (File Name Expected) I solved the problem. for some reason it was looking for sdb8 as per the grub that was picked up from sda8. I used Super Grub and took the grub from sda8 and put it in the mbr. It now boots up fine, but I wanted to use my grub2 in my primary OS which is linux mint. I multi boot. It appears that the trouble is caused because I have a USB External Hard drive that is hooked to a USB3 card in my computer. guess I will have to edit grub config to set which distro boots first by default. The reason I don't want to do that is because everytime I add a new distro and run (update grub) I will have the same problem all over again. I don't have this problem with other distros.
Mel