Unfortunately, the version of Ubuntu installed was 12. As fun and nostalgic as that was, I immediately set about upgrading to the latest stable build. Running the upgrade was simple enough.
sudo apt-get update sudo apt-get upgrade sudo apt-get dist-upgrade sudo apt-get install update-manager-core sudo do-release-upgrade
Everything worked at first, I even went through the process of installing some applications such as Gnome Terminal, Gimp and Git (Crouton installs the minimal release--so barely any applications). However, I ran into a snag when I rebooted. The sudo startunity command would fail with a nasty message.
[ 727.514] (WW) The directory "/usr/share/fonts/X11/75dpi" does not exist.
[ 727.514] Entry deleted from font path.
[ 727.514] (==) FontPath set to:
727.526] (EE) Segmentation fault at address 0x0
[ 727.526] (EE)
Fatal server error:
[ 727.526] (EE) Caught signal 11 (Segmentation fault). Server aborting
[ 727.526] (EE) Please also check the log file at "/tmp/Xorg.crouton.1.log" for additional information.
[ 727.527] (EE)
I prefer the Unity desktop, so that's the one I had originally installed. To work around the error, I reinstalled Unity using the same command in the original setup article:
sudo sh ~/Downloads/crouton -t unity.
To be clear, this simply reinstalls the desktop. I still had the latest version of Ubuntu and the applications I had installed after running the Crouton install.