linux-image-386 and nvidia driver

[Serg]

Howdy All, 

I have recently upgraded package:
Linux-image-386

This is basically (and as far as I can tell) an abstract of package:
linux-image-2.6.15-26-386

Previous (and now current) version I was/am using is:
linux-image-2.6.15-23-386.

After the upgarde, the X server refused to start with message relating
to it not being able to find Nvidia driver. So I uninstalled:
linux-image-386
linux-image-2.6.15-26-386

and reverted back to:
linux-image-2.6.15-23-386

Is there any explanation as to why this happens? And is there a way to
fix this?

My current (related) packages are:

linux-image-2.6.15-23-386                3.2.2-1ubuntu7
nvidia-kernel-common                     20051028+1
nvidia-glx                               1.0.8762+2.6.15.11-1
linux-restricted-modules-2.6.15-23-386   2.6.15.11-1


Thanks,
   Serg