Here is a good guide on how to install VMWare Server under Ubuntu, v6.x:
It worked a treat for me!
VMWare Server – installing on Ubuntu
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Simon is a Boston, USA, based Virtualization, Cloud & IT Technology Evangelist. He loves working in the ever-changing IT industry & spends most of his time working with Virtualization, Cloud & other Enterprise IT-based technologies. As well as on this site, you can find him on Twitter