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Ubuntu Kernel Module Problems
When you have problems building modules on Ubuntu, install kernel source, untar kernel source (this is stupid - why don't they just install it when you ask them to?), run make prepare in kernel source, and run make scripts as well. make oldconfig may be necessary as well.
Sigh. It appears you may need to run a full make in the kernel source as well in some cases. I keep asking myself why I put up with Ubuntu's crap and I keep not coming up with a good answer. :-(