Even though the NUC D54250 series is discontinued, you might have an old one that wasn’t BIOS upgraded to fix hibernation.
I had experienced with NUC D54250 BIOS version 0030 from Sept. 2014 that hibernate in Ubuntu 14.04 didn’t work for me. Upon resume with a Displayport monitor, I just got a scrambled screen.
Intel NUC BIOS upgrade procedure
- Download Intel NUC BIOS. This page is sorted by date
- Extract the IFLASH.EXE and
.biofile to a USB flash drive.
- Reboot the NUC and at the BIOS flash screen press F7
- select the flash drive to boot from.
The Intel NUC BIOS upgrade takes 4-5 minutes.