VMware no longer compiles after upgrade
Solution 1:
I've also had problems running VMWare Player after upgrading Ubuntu from 10.4 to 10.10 as it could not recompile it's modules (due to the changes in kernel) - this guide helped to solve that issue.
Also I've had issues with non-compilable VMCI Sock module (due to the changes in the kernel). Please see this link for the solution.
These two patches worked fine for me.
Solution 2:
As of now, according the VMware forums, you must upgrade VMware to version 7 to use VMware Workstation under Ubuntu 10.10. A updated version of VMware 6, compatible with Ubuntu 10.10, maybe released at a later date.