Comment 34 for bug 292606

Why does the nvidia-common kernel postinst even exist? It looks like it's only purpose is to replicate the functionality that was there from the nvidia-common postinst. Obsoleted drivers won't be introduced by new kernel images, but instead by newer modaliases as detected by nvidia-common.

nvidia-common's postinst already does this, so I don't see any reason why this script should be sticking around in /etc/kernel/postinst.d.