have you installed npm succesfully? If not follow the link bench.utils.CommandFailedError: npm install - #8 by arokia
and follow below commands:
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curl -sS https://dl.yarnpkg.com/debian/pubkey.gpg | sudo apt-key add -
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echo “deb https://dl.yarnpkg.com/debian/ stable main” | sudo tee /etc/apt/sources.list.d/yarn.list
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sudo apt-get update && sudo apt-get install yarn