Follow here: https://jekyllrb.com/docs/installation/ubuntu/ Then:
# clone repo
git clone https://github.com/frietz58/frietz58.github.io.git && cd frietz58.github.io
# locally install jekyll
# https://jekyllrb.com/docs/step-by-step/01-setup/
bundle
bundle exec jekyll build
bundle exec jekyll serve
Based on :Minimal Mistakes Jekyll theme