hi gary
I do not have much knowledge myself, so I would wait for some proper advise.
Which version of opengeu have you got

It does seem like some basic parts of your system are missing, maybe reinstall from the beginning.
Or you simply follow the advise in your second posting and install the missing packages (i have so far always
run my Opengeu alongside ubuntu and xubuntu, so when I log in I have choices of other desktop environments).
maybe wait for better advise.
zoe