See also https://github.com/puppeteer/puppeteer/issues/6192
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 &&\
apt update &&\
- apt install -y libgconf-2-4 google-chrome-stable yarn nodejs &&\
+ apt install -y libgconf-2-4 libxss1 google-chrome-stable yarn nodejs &&\
npm install -g eslint babel-eslint &&\
cd /var/www/discourse && sudo -E -u discourse -H yarn install