Hi, regrettably (or to my luck ?) i don't have a NUC in reach.
Intel says it should be possible to install GNU/Linux: https://www.intel.com/content/www/us/en/support/articles/000005499/mini-pcs.html Suspicious is that they list particular NUC models for Ubuntu. (What about the others ?) Debian has a list of usable NUCs https://wiki.debian.org/InstallingDebianOn/Intel/ which differs from Intel's Ubuntu-NUC list. Intel indicates that its "BIOS" needs human help: https://www.intel.com/content/www/us/en/support/articles/000022600/mini-pcs.html A mini Linux named "OpenElec" is mentioned with BIOS settings. Maybe its example works for Debian, too. If you cannot get legacy mode to work, then consider to report your problem to debian...@lists.debian.org It will be necessary that you tell the exact URL from where you got the ISO image and that you confirm its SHA512 checksum matchiing the recorded one in file SHA512SUMS from the same remote directory as the ISO. Have a nice day :) Thomas
