As simple adding PPAs is not supported ( for UKUU ) I tried adding
deb http://ftp.debian.org/debian stable main contrib non-free
This gives me an enormous amount of packages to update and a similarly long list of packages stating
The following packages have been kept back: ...
This worries me a little bit and I am not sure if it is a good idea to go for it. On the other hand I believe that this offers---in principle---a 4.x kernel.
Opinions and advice appreciated, cheers.