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Install ruby:

$ sudo apt install ruby-full

Install build-essentials:

$ sudo apt install build-essential

Solution for 'Cant find gem bundler (>= 0.a) with executable bundle' https://bundler.io/blog/2019/05/14/solutions-for-cant-find-gem-bundler-with-executable-bundle.html:

$ sudo gem update --system

Install bundler and jekyll:

$ sudo gem install bundler jekyll

$ bundle update --bundler

Run:

jekyll serve