Installed system-config-printer-gnome, cups and hplip to get printing from my Chromebooks crouton chroot going and then ran into an error when trying to run system-config-printer:

ERROR:root:Could not find any typelib for Gdk

Tried a fix mentioned on the internet, but this didn't fix it, saying the package was already installed

sudo apt-get install gir1.2-notify-0.7

So did the following which seems to have fixed the problem

sudo apt-get install gir1.2-gtk-3.0