Just run these commands from bash ..
This will install nodejs 14, if you want to install latest or older version of nodejs.. you should change /setup_14.x like /setup_12.x
Install NodeJS on Ubuntu
curl -sL https://deb.nodesource.com/setup_14.x | sudo -E bash - sudo apt-get install -y nodejs
sudo apt install npm
Run the following commands if you are using WSL on Windows 10 and npm and node do not run and returns error.
Setting up Bash as default on vs code
Go to setting and click the page icon on the right top..
Paste the following code in #settings.json to set bash/wsl as default terminal in vs code.
Now you should see bash as default whenever you launch terminal