I recently purchased an Acer Chromebook 14 CB3-431-C6UD and using this guide, I managed to successfully set up Ubuntu on a 64gb usb drive that I keep plugged in at all times.
However, since I have been able to boot Ubuntu (or get to the desktop, prior to the installation of the OS) I noticed the severely impaired functionality of the on board trackpad and keyboard or lack thereof regarding the latter.
While I have been able to find a fix for the trackpad issue, there seems to be no known solution for the keyboard one.
Any help would be greatly appreciated.