I have see over the last few year that is is getting more difficult to install ubuntu.
Usually it is no problem to boot from USB (CD's is obsolete anyway) But booting from USB on these machines is difficult, sine they do not seem to recognize the Ubuntu USB as bootable.
My problem is That I am not able to install Ubuntu on any of our new laptops from 2015.
Note. We have been using Ubuntu since 2006 (tack!!) But lately it is getting more difficult to install on new machines, and it used to be very easy!