Yesterday I updated my Ubuntu from Edgy to Feisty, just one day after doing it from Dapper Drake, and that because on Edgy my Intel Pro/Wireless stop working, but now with Feisty seems to be working again, anyway my VMware Server stop working and the did not success to compile the module for my Kernel 2.6.20-12-generic.

so I applied the same steps I did for my Debian Etch configuration, and it worked, here is the how to.

Installing VMware Server on Debian Etch