Bootable flash drive booting system GRUB2?

Question

linux

Created a bootable USB stick with a Linux distribution (using Linux Debian). I created it like this:
1. Formatted the flash drive using mkfs.vfat /dev/sdb1
2. Translated iso using dd if=./path/distr.iso of=/dev/sdb1 bs=4m;sync
Everything seems to have gone well, here the contents of the flash drive:

I tried to boot from it by pressing F8 when turning on the PC and selecting the flash drive, after which, instead of a happy action selection menu, my system GRUB2 appeared in front of me with a suggestion to choose which system I should boot from (there are two systems on the PC - win10 and linux Debian) .
How to fix it?

Answer 1

Perhaps you should understand how the installation disk works.
Finish the first option manually: with
this command, the image was uploaded to a USB flash drive
you need to go through some utility (for example, cfdisk, fdisk) and set the boot flag for the /dev/sdb1 disk
Second option:
use the unetbootin utility, the utility will do everything itself and the image will be flooded and the bootloader will configure correctly.