I'd like to install the full Ubuntu 12.04 Desktop, but frequently I want run the computer in 'server' mode - ie, command line only. Occasionally, I'd want to run the Desktop.
I'd rather not dual-boot between Desktop and Server editions.
If it is possible, or necessary, I'll install the Desktop and the Server on the same partition (to make sure all the necessary packages are present).
This is an old computer, with limited memory (384MB) so I don't want the Desktop running when I don't need it - which is most of the time.