Ubuntu is not currently on the roadmap, however in the past several weeks there have been several requests to add Ubuntu to the supported platform list.
SCSP Engineering is in the process of evaluating whether or not to support this platform. If there is enough interest in this platform, then there is a higher chance of it being pursued.
If you would like to PM me with potential seat counts, please do so.
What has happened with Ubuntu in the past few months? The amount of requests we are getting for this is increasing . . .