I've used VirtualBox on a mac server, to run Ubuntu server instances, and I've liked it.
However I have a little bit of difficulty, because VirtualBox seems to be a GUI thing, so I SVN into my mac server, and use the GUI to run it, It would be great if I could somehow run an ubuntu (server) instance, from shell when I SSH into it.
I'm looking for a simple way I don't want to get too much into advanced virtualization tools/methods, something like VirtualBox or VirtualBox itself would be great.