The previous versions of initramfs-tools used a hardcoded list of modules in that case, and atl2, atl1c, jme, r8169 etc were missing.
I think that this problem was fixed in recent initramfs-tools versions, where the list of modules is determined automatically.
Adding initramfs-tools to "Affects", and maybe someone can verify that this problem is fixed-released in Natty.
LTSP notifies initramfs-tools to use MODULES="netboot":
$ grep MODULES /opt/ltsp/ i386/usr/ share/initramfs -tools/ conf.d/ ltsp
MODULES="netboot"
The previous versions of initramfs-tools used a hardcoded list of modules in that case, and atl2, atl1c, jme, r8169 etc were missing.
I think that this problem was fixed in recent initramfs-tools versions, where the list of modules is determined automatically.
Adding initramfs-tools to "Affects", and maybe someone can verify that this problem is fixed-released in Natty.