Install kernel headers for kernel packages as well
(so that dkms works properly).  Make a special type for
installing kernels.
Put nvidia-current (and later, fglrx package) into ltsp image.
These are tricky because they break other drivers,
and fglrx even conflicts with nvidia-current.
We try to use the upstream packages, and play the necessary
alternatives/ldconfig-tricks elsewhere.
Simplify the fglrx/nvidia configuration codes a bit
(and do not even pretend to handle the (!= i386) case
that we are not testing anyway.
Oops.  All graphic drivers alternatives/ldconfig tricks should
be done *after* all packages have been installed
(so that ldconfig caches are good in all cases).
Clarify why we require packages when setting up graphic drivers
ls.so.cache files.
Remove /etc/modprobe.d/nvidia-current_hybrid.conf,
this should allow nouveau to work, even when nvidia-current
package is installed.
I think that /etc/modprobe.d/fglrx.conf should be removed as well
(for radeon to work).
Put back modprobe blocks for nouveau and radeon, for now.
Perhaps "blacklist" should be enough,
or removing these at boot (so that nouveau and radeon also work).
Also, update ld.so.cache-* files when needed).
Blacklist nouveau and blacklist radeon, so we can later load nvidia
and fglrx.  But do not set the "off"-alias, because in nouveau case
that apparently may cause the loading of nvidia?  (I *am* starting to
get totally confused by this stuff).