Compiling Asterisk requires Ubuntu source?

[Don Kelly]

I'm new to Ubuntu and new to Asterisk. I'm attempting to compile Asterisk in
6.06.1 and when I attempt to 'make' zaptel I get the error:

No source for 2.6.15-28-amd64-generic kernel.

I installed Ubuntu from a downloaded iso. Apparently this doesn't include
source? How do I get the source?

  --Don

Don Kelly
CT Magic