How to install yarn in ubuntu 20.04?

@wayne.swaniawski 

To install Yarn on Ubuntu 20.04, follow these steps:

1. First, update the package manager's package list by running:

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sudo apt update

1. Install the dependencies needed to add the Yarn package repository to your system by running:

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sudo apt install curl gnupg

1. Add the Yarn package repository to your system by running:

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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

1. Update the package manager's package list again to include the Yarn package repository by running:

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sudo apt update

1. Install Yarn by running:

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sudo apt install yarn

1. Verify that Yarn was installed successfully by running:

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yarn --version

This should print the version number of Yarn that was installed.