VMware has declared VMware Server End Of Availability on January 2010 with the actual support ending on June 30th, 2011. More details can be read here. Furthermore, VMware Server is not officially supported on Ubuntu releases greater than 8.04.
The VMware Server console plug-in won’t work on Firefox versions older than 3.6 (I have found no viable solution for this problem).
The needed instructions for the installation can be found here. For comments related to the installation on machines running the 2.6.38 kernel version please post here.