Ubuntu 16.04 (or any other recent linux) and the Canon LBP6020B laser printer

My last post on battling with the Canon LBP6020 seems to have been quite
populer (my one and only post that regularly appears near the top of a
relevant google search), however it's getting a bit old now (Ubuntu
14.04).

I switched my daily laptop from Ubuntu to Arch Linux about a year ago,
and at the time was able to install the Canon drivers through the AUR
and everything was fine (as much as it ever is with a LBP6020).
Sometime earlier this year a regular update changed all that and it
hasn't worked since.

I finally got around to learning about docker and thought that it might
provide a solution to the LBP6020, i.e. a stable environment in which to
run the driver.

Now thanks to ticosax/cups-in-docker and Nik I've got a docker container
which appears to be reliably printing (although admittedly with only a
little testing).

If you're running Ubuntu 16.04, or any other linux capable of running
docker, this may provide a simple way to get a LBP6020 printing.

The docker image can be built from:

https://github.com/akgrant43/cups-in-docker

Instructions are in the readme.