As I recently bought a new Windows Laptop and installed Ubuntu, an envionment of maintaning this Github pages personal blog needs to be set up. Here is just a small memo for myself on some fo the commands that are not mentioned in the tutorial.
Install Ruby:
sudo apt-get install ruby-full
Check Ruby version:
ruby2.3 -v
Install Gem:
sudo apt-get install rubygems
Install Bundle:
sudo gem install bundler
The rest of the commands are all mentioned in the official doc.