• Update the repositories.

   $ sudo apt update

• Install node and npm.

   $ sudo apt install nodejs npm

you can look at the version with:

 $ nodejs --version

 output: v10.19.0

If you want to know more here I leave you a blog that explains it in more detail.

https://linuxize.com/post/how-to-install-node-js-on-ubuntu-20-04/