Guess you have uefi BIOS and you try to run normal boot install. That will not work.
Hi and sorry for the delay,
I do not know why but the "Live mode" does not work, not launch, error like "gpu stuck"
Well... well.. I have installed BackBox in "compatibility mode"
It is so cool, but .. No ... I obviously have no luck !
When I launch Backbox, error! "The disk drive for /dev/mapper/cryptswap1 is not ready or not present, blablabla". ..
The solution: launch backbox into the recorvery.. Then click on launch in the recorvery :/ But it's not very cool...