To install VMWare Workstation in Ubuntu 9.10, download it from VMWARE, you will need a license key, it is not free.
1. Once you downloaded it, put it on the the desktop.
2. Start a terminal session by going to Applications, Accessories, Terminal.
3. cd over to the Desktop - usually you start at your home folder, so cd Desktop.
4. run the following command (without quotes) "sudo sh VMware-Workstation-Full-7.0.1-227600.i386.bundle"
5. Run the install wizard as you normally would.