From a user forum:

To get a user console:

1. Press ALT-F1
2. Type 'unsupported' (without the quotes) THERE IS NO ECHO AS YOU TYPE!
3. If you've typed 'unsupported' correctly, you'll be in the tech support mode and you can do stuff, like enable SSH for remote login and all that jazz.

Of course, the proper way is to download the command line virtual machine, but this is quick, if a little dirty.