Requirements

• Visual Studio code or Webstorm (IDE)
• Node Js
• NPM
• Angular CLI

Step 1: Install Visual studio code

Use following link you can install VS code

How to Install Visual Studio Code on Ubuntu 18.04

Step 2: Install Node JS 

 Use Following command on your terminal 

$ curl -sL https://deb.nodesource.com/setup_12.x | sudo -E bash -

$ sudo apt-get install -y nodejs

Check Node JS is installed or not using following command

$ node -v

Step 3: Install NPM(Node Package Manager)

$ sudo npm install npm@latest -g

Step 4: Install Angular CLI(Command Line Interface)

$ sudo npm install -g @angular/cli

If you want specific version

$ sudo npm install -g @angular/cli@12.1.1

$ sudo npm install -g @angular/cli@10

$ sudo npm install -g @angular/cli@8

If you want to check Angular CLI is installed or not

$ ng -version