Installing yarn

There are many methods by which you can install yarn. The simplest one is to install it through npm (yes, this is quite ironic):

$ npm install --global yarn

However, this is not recommended because the packages are not signed, which means you cannot be sure it came from an authentic source; this poses a security risk. Therefore, it is recommended to follow the official installation instructions outlined at https://yarnpkg.com/en/docs/install#windows-stable. For a Ubuntu machine, we should run the following:

curl -sS https://dl.yarnpkg.com/debian/pubkey.gpg | sudo apt-key add -
echo "deb https://dl.yarnpkg.com/debian/ stable main" | sudo tee /etc/apt/sources.list.d/yarn.list
sudo apt-get update && sudo apt-get install yarn