Hi, as solitone stated, the most simple way is to make use of the isohybrid preparations of the ISO image.
> https://hyper.to/blog/link/debian-installer-on-a-usb-key/ (I wonder how this setup knows that it should use the ISO as source of higher operating system levels.) > No filesystem could mount root, tried: > Kernel panic - not syncing: VFS: Unable to mount root fs on unknown - block > (0,0) > I used to be able to make > viable writable install thumbdrives for Debian 7 and 8. What happened? Are you sure that your USB stick is still ok ? Can you mount the FAT filesystem in a running Linux system ? Have a nice day :) Thomas