tks enormously James for you attention. I ran all the commands you told me and besides that I took the opportunity to only keep ext4 enabled on file system in the kernel. I manage to start x again.
No problems! Generally speaking if you "update the kernel":
you also have to "update any 3rd party kernel modules".
This includes nvidia, virtualbox and probably a few others.
Reaosn being is that a "make modules_install" blows