First, install Docker Community Edition.

Then, create a local working directory in your computer. Let's say its absolute path is given by absolute-path.

We use a variety of archives that will be updated whenever needed. The most important are the rvgs-1.x.x.zip, src-1.x.x.zip, fonts-1.x.x.zip archives. Here, x.x starts at 0.0 and will be incremented for each new release. Download all these into your local working directory at absolute-path.

Now run the docker container as follows

docker run -it --rm \
           -e USER=$(id -u -n) \
           -e GROUP=$(id -g -n) \
           -e UID=$(id -u) \
           -e GID=$(id -g) \
           -w /home/$(id -u -n) \
           -v `pwd`:/home/$(id -u -n)/host \
           diegonehab/vg

You should be dropped into Ubuntu 20.04 with everything installed, and a directory /home/<USER>/host that mirrors the contents of your local absolute-path directory.

The following command will extract all archives and create links without the version numbers.

for t in *-*.zip; do
    d=$(echo $t | sed -e 's/-.*//g');
    rm -f $d && unzip $t && ln -s ${t/.zip/} $d;
done

Have fun.