I have been running ubuntu 14.04, then 14.10 on my Intel NUC model DN2820FYKH for months without any issues. I recently reformatted and reinstalled a fresh copy of 15.04, and after doing so I am now unable to reboot or shutdown, via terminal or from the GUI. Upon doing either, I get the purple loading screen, and there it stays. One difference I've noticed is that while shutting down, the progress bars appear to move for a while before freezing. When rebooting, they never move at all. I have to go to the box, hold down the power button, then turn it back on.

So far I have run all updates, and tried the following solution:

Ubuntu 15.04 freezing on shutdown/reset and having problem with Nvidia

This appears to be the same issue:

14.10 to 15.04 upgrade, now I can't poweroff or reboot!

update: I tried adding acpi=force to my grub file as detailed here:

Shutdown does not power off computer

This did not fix the issue.

  • try to add this GRUB_CMDLINE_LINUX='acpi_enforce_resources=lax' to GRUB and then run sudo update-grub
    – JoKeR
    Jun 30, 2015 at 8:43
  • Thanks for the suggestion. Still not fixed, although now I can see that the freeze occurs after "reached target shutdown." A quick Google search seems to show that my intel NUC bios just doesn't recognize the shutdown command being issued, although it worked on previous ubuntu versions. I tried the latest BIOS update from intel, which is only a week or so old, but same result.
    – eljefe
    Jul 2, 2015 at 4:24
  • in this case if it's might be a bug you could post it to Launchpad also.
    – JoKeR
    Jul 2, 2015 at 11:18

2 Answers 2


You need to do the following for the NUC model DN2820FYKH

Update the BIOS to version FYBYT10H.86A.0055

download the update from Intel here

Then add reboot=bios as a boot parameter:

sudo -H gedit /etc/default/grub

Find the line that begins GRUB_CMDLINE_LINUX_DEFAULT= and change it to:

GRUB_CMDLINE_LINUX_DEFAULT="quiet splash reboot=bios"

Save and exit, and run

sudo update-grub

Then reboot. This worked on Xubuntu 16.10 for me.



Reboot only worked between the BIOS update and a poweroff. After that one poweroff and restart, reboot no longer works. Updated BIOS does not fix the issue.

I am now using this script to force a reboot if really needed (its a development machine)


service mysql stop
service apache2 stop

sleep 1
sleep 1

echo 1 > /proc/sys/kernel/sysrq
echo b > /proc/sysrq-trigger

old bad answer follows.

I had this same problem with this NUC model: NUC DN2820FYKH

Upgrading to version 52 of FYBYT10H.86A BIOS fixed the problem.

Download link: https://downloadcenter.intel.com/es/download/25448/Actualizaci-n-de-BIOS-FYBYT10H-86A-

  • UPDATE: I downgraded the newer-bios NUC to kernel 3.13.0-24 and it now reboots just fine. Maybe an incompatibility between newer BIOSes and newer ubuntu kernels? Feb 11, 2016 at 21:42

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