How to install yarn in ubuntu 18.04?

@samara 

To install Yarn on Ubuntu 18.04, follow these steps:

1. First, update the package manager index by running the following command:

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sudo apt update

1. Next, install the dependencies needed to add a new repository by running:

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sudo apt install curl software-properties-common

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 index again:

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sudo apt update

1. Finally, install Yarn by running:

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sudo apt install yarn

1. You can verify the installation by checking the version of Yarn:

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yarn --version

You should see the version number of Yarn printed to the terminal.