*UPDATE: It is not the FOG server as I was able to boot an OLDER (Legacy) Lenovo to the FOG Main menu screen. SO this appears to be an issue with the newer BIOS/Secure boot or even possibly a NIC incompatibility. I will search elsewhere.

@ccheltenham I am having a similar issue with the imaging. I am using an old laptop to make the server portable if I need to go to travel to another physical location. I installed server 20.04, then installed a full GUI (GNOME) set statically the server on the NIC, and I am using the wireless for internet updates. I updated and upgraded the server then installed fog as a DNS/DHCP/router. The software installed correctly and I have changed the fog password like any good IT person should. the client boots to pxe on IP4 then attempts to load PXE on ipv6 there it will sit for about a minute then boot into windows. the PC is getting DNS/DHCP but not booting for me to do the image. the device I am trying to update/image is a Lenovo E15 i have noticed that a few lenovos are having similar issues here.