Danil Smirnov writes:

Okay I've found that image can be built if you base on Ubuntu Trusty distro (line 6 of the Dockerfile: "FROM ubuntu:trusty") and add ruby-sass to the set of packages to install (line 13: "apt-get install -y git python3-dev python3-pip python-dev python-pip python-virtualenv ruby-sass").

The absence of sass is a known problem with Debian-derived systems.

I'm not sure whether I need to change it in the Wiki...

Please do, but do mention that currently it seems to a problem only for the Debian family of distributions.

Steve