I picked up an Intel d34010wyk NUC. Came with 8GB of ram and no SSD. I bought a 256GB mSATA drive and a USB adapter to flash the image. Flashed the image using Etcher with no issues, reinstalled the SSD and booted up the NUC. Unfortunately, it’s not seeing the SSD as bootable and keeps asking to insert boot drive. Any ideas?
In addition to what Tom said, make sure it has the ssd as the boot drive. also make sure it’s not set to use recognised O/S - it will now recognise Debian (since Buster) and Ubuntu and Windows but hassos won’t be and won’t install… proxmox also won’t likely work.
Thank you for the info. I updated the BIOS and set the boot order correctly. Tried manually selecting the drive on boot. Even tried flashing the image to a usb drive and had the same issue. This is the SSD Drive. I was able to boot into a windows install with out issue, so not sure what is the problem. However, I did not see any options for recognized OS, is that in the NUC’s BIOS?
It may be a UEFI thing.
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Here’s some more settings you could try:
In particular, I’d try:
On the Boot > Boot Priority menu:
- UEFI Boot is disabled (unchecked).
- Legacy Boot is enabled (checked).
EDIT: just beaten to it by Nick.
Yes it is in the NUC Bios… It has to be an allowed O/S otherwise it won’t boot off it. I’m not taking my NUC down to find the exact message/setting so you are going to need to look for it.
Secure Boot I think it is and it needs to be disabled.
Just looked, already had secure boot disabled. I turned it back on for the hell of it, which automatically enabled UEFI and it actually booted up. It’s currently installing. 
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Good job… it’s just one of the things you don’t think of…