specifically these lines:
sudo apt-get update
sudo apt-get install ubuntu-desktop
sudo apt-get install gdm
sudo /etc/init.d/gdm start
sudo dpkg-reconfigure xserver-xorg
The resulting download is over 300MB, so it will take some time to finish with the process. In the meanwhile, one will have to suffer with the command-line ;).
After that, Flex training took up the rest of the day. Started out on the easy side, going over the 'Introduction' and 'Getting Started' videos. Mostly reinforcing what was already known, though there were a few interesting bits, like making full use of a two-monitor setup by detaching some of the Flex windows from the main application and putting it in the spare screen area. Then one can save that perspective and reuse it. It is applicable to Eclipse as well, seeing that the Flex Builder is built on it.