https://tecadmin.net/install-latest-nodejs-npm-on-ubuntu/#
Run following scripts
$ sudo apt-get install python-software-properties
$ curl -sL https://deb.nodesource.com/setup_7.x | sudo -E bash -
$ sudo apt-get install nodejs
$ node -v
$ npm -v
Now install Angular
$ sudo npm install -g @angular/cli
$ ng -v
Now install Typescript
$ sudo npm install -g typescript
$ tsc -v
$ sudo npm install -g gulp
$ gulp -v
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