Here is a good guide on how to install VMWare Server under Ubuntu, v6.x:
It worked a treat for me!
About Simon Seagrave
Simon is a UK based Virtualization, Cloud & IT Technology Evangelist working as a Senior Technology Consultant and vSpecialist for EMC. He loves working in the ever changing IT industry & spends most of his time working with Virtualization, Cloud & other Enterprise IT based technologies, in particular VMware, EMC and HP products.
As well as on this site, you can find him on Twitter and Google+