I have Ubuntu 15.10 running on the internal SSD of a Acer CB3-111-670 Chromebook. After some running around to fix the audio, the last thing (that I can tell) doesn't work is the shortcut keys (volume and brightness are the only ones I really care about.) I can however, change the volume and brightness in settings using a mouse.
I believe (but am not certain,) that the shortcut keys are being recognized as f1-f12, but they don't seem to be in the correct order (off by one) and are not doing what you would expect.
For instance, if I press the 'brighten' button, which by counting the buttons starting from the far left as f1, the brightness key would be associated with f8--when pressed I get a pop-up box that says, "Pressing f7 turns caret browsing on or off..." as apposed to actually making the screen brighter.
Any help would be greatly appreciated.