Prerequisites to get darkcast to work on lxplus:

needs logging in with a graphical session (conda will look for DISPLAY)
wget https://repo.continuum.io/miniconda/Miniconda2-latest-Linux-x86_64.sh
chmod 755 Miniconda2-latest-Linux-x86_64.sh
when you ask to put the miniconda directory in your PATH say no
export PATH=/afs/cern.ch/user/d/doglioni/Work/miniconda2/bin:$PATH
conda create --name=darkcastenv python=2.7
source activate darkcastenv
conda install -c conda-forge matplotlib
every time you log in:
export PATH=/afs/cern.ch/user/d/doglioni/Work/miniconda2/bin:$PATH
source activate darkcastenv

How to install and run darkcast example:

wget https://gitlab.com/philten/darkcast/-/archive/master/darkcast-master.tar.gz
tar -xzvf darkcast-master.tar.gz
mv darkcast-master darkcast
cd darkcast/examples
python invisible.py