Desktop

Disabling

If you are running a production deployment and don't need the desktop environment, you can disable the GUI altogether and boot in text mode:
http://askubuntu.com/questions/16371/how-do-i-disable-x-at-boot-time-so-that-the-system-boots-in-text-mode

Support

If you need to keep running the desktop environment and you're running XFCE, LXDE, or another desktop environment that is on the 3-year support cycle, you will most likely want to switch to a fully supported desktop environment until we're ready to move off of Ubuntu 14.04. We've prepared a package to make it easy to switch to Gnome Flashback.

Installing

Install the new securityonion-desktop-gnome package:

sudo apt update && sudo apt install securityonion-desktop-gnome

Converting to Gnome Flashback

Run the script:

sudo so-desktop-gnome

Press Enter to continue and review all output. When the script is finished, press Enter to reboot.