Why does grub4dos appear when installing ubuntu?

Question

linux

I'm trying to install ubuntu from a flash drive.
But it stubbornly throws me not on the installer, but on grub4dos.
I look at it like a ram at a new gate, because I have not met with this before.
Help what to do next.
I read a bunch of grub4dos manuals. But I can't really figure out how to get out of this situation. THX

Answer 1

1) How did you make a bootable USB flash drive?
2) What is the boot order in the BIOS?

Answer 2

There is a choice, something like default, install and boot. When you select one of these options, the download should begin
. I always do it myself with the help of unetbootin.