Running Ubuntu gui on chromebook

Hi,

I want to run a full ubuntu distro on my chromebook complete with gui.

I am running the linux beta on the latest version of chromeOS.

It is important that I have gnucash,libre office and that my printer is recognised on my usb port.

I followed the instructions on https://codeopolis.com/posts/quick-and-easy-steps-to-install-docker/

and ran the command docker run -it ubuntu bash

a bash shell appeared, but there was no gui.

what do I have to do to get all the tools and apps that I need?

Brian