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 | 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.

source ~/.profile

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.

"": "C:\\Windows\\System32\\bash.exe",

Now you should see bash as default whenever you launch terminal