Why does Grub2 give a boot error?

Question

linux

Some magic happens:
There are 2 absolutely identical Foxconn nT-435 nettops, the BIOS settings are the same.
On one of them I created a bootable SD card with Debian7, GRUB2 bootloader, everything works fine.
I insert this card into the second nettop:
1) If a keyboard is connected to it at the time of loading, everything loads fine.
2) If there is no keyboard, Grub gives an error: error: incompatible license
What kind of magic is this?

Answer 1

Try it.

grub-install --recheck 
update-grub