ASUS BIOS keeps resetting Boot priority to Windows Boot Manager before UEFI

Solution 1:

After more digging found one answer here that is working.

http://www.tomsguide.com/answers/id-1973164/change-asus-boot-order.html

I just completed a CHAT session with ASUS. It worked!! Here is what they told me:

1. Enter the BIOS setup menu by pressing and holding F2 key when powering on.
2. Switch to “Boot” and set “Launch CSM” to Enabled.
3. Switch to “Security” and set “Secure Boot Control” to Disabled.
4. Press F10 to save and exit.
5. Press and hold ESC key to launch boot menu when the Unit restarts.

We now get the following (happy!) screen:

And we can get to the Ubuntu Boot Disk:

(* 20 mins pass *) And now I am logged in and editing this question from the (successfully) installed ubuntu 15.10 woot!

Solution 2:

Just solved this problem by DISABLEing the FAST BOOT option in te BOOT tab. And then all the disks are selectable further on that TAB