Unable to connect to http://localhost:8000/ in Ubuntu1804x64

[mxochicale]

Successful installation of npm and dependencies in Ubuntu1804x64

sudo apt update
sudo apt-get install nodejs-dev node-gyp libssl1.0-dev
sudo npm install -g n
sudo n stable
sudo npm install npm@latest
sudo npm install npm -g #https://stackoverflow.com/questions/29956610/error-npm-update
sudo npm install --global cross-env #https://stackoverflow.com/questions/43685777/laravel-mix-sh-1-cross-env-not-found-error

then i got this

$ npm run develop

> libre-robotics-gatsby@0.0.1 develop /home/air4children/Desktop/github/site
> cross-env GATSBY_GRAPHQL_IDE=playground gatsby develop

success open and validate gatsby-configs - 0.023s
success load plugins - 0.648s
success onPreInit - 0.003s
success initialize cache - 0.010s
success copy gatsby files - 0.042s
success onPreBootstrap - 0.014s
success createSchemaCustomization - 0.005s
success source and transform nodes - 0.189s
success building schema - 0.386s
success createPages - 0.028s
success createPagesStatefully - 0.237s
success onPreExtractQueries - 0.002s
success update schema - 0.044s
success extract queries from components - 0.359s
success write out requires - 0.039s
success write out redirect data - 0.009s
success onPostBootstrap - 0.003s
⠀
info bootstrap finished - 4.238 s
⠀
success run queries - 0.070s - 9/9 127.84/s
⠀
You can now view libre-robotics-gatsby in the browser.
⠀
  http://localhost:8000/
⠀
View the GraphQL Playground, an in-browser IDE, to explore your site's data and schema
⠀
  http://localhost:8000/___graphql
⠀
Note that the development build is not optimized.
To create a production build, use gatsby build
⠀
success Building development bundle - 3.206s

—————————————————————————————————————————————————————————————————————————————————————————————————————————————————————————————————————————————————————————————
10 pages                                                             Success                                                            libre-robotics-gatsby
^C^C

but when trying this

firefox  http://localhost:8000/

I got this: Unable to connect

Any ideas?

[mxochicale]

Installing Gatsby plugins

sudo npm install --global gatsby-cli #https://arador.com/how-to-install-gatsby-on-ubuntu-18-04/
sudo npm i gatsby-transformer-sharp gatsby-plugin-sharp gatsby-background-image
sudo npm i gatsby-image
sudo npm i gatsby-remark-images
sudo npm i gatsby-plugin-webpack-bundle-analyzer

:warning:

found 627 vulnerabilities (622 low, 4 moderate, 1 high)
  run `npm audit fix` to fix them, or `npm audit` for details

[mxochicale]

Perhaps it is not an appropriate practice but using the following lines the site seems to work!

sudo npm run develop

google-chrome http://localhost:8000/

[mxochicale]

closed as it is outdated