1. Prerequisites

   • Ubuntu 18.04, 17.10, 16.04
   • root privileges
   • few knowledge using vim

   Step 1 Install some Debian package development tools and library

   sudo apt-get install dpkg-dev build-essential zlib1g-dev libpcre3 libpcre3-dev unzip
   

   Step 2 Adding nginx repo

   sudo nano /etc/apt/sources.list.d/nginx.list
   

   Paste in two string

   For Ubuntu 12.04:

   deb http://nginx.org/packages/ubuntu/ precise nginx
   deb-src http://nginx.org/packages/ubuntu/ precise nginx
   

   For Ubuntu 14.04:

   deb http://nginx.org/packages/ubuntu/ trusty nginx 
   deb-src http://nginx.org/packages/ubuntu/ trusty nginx
   

   For Ubuntu 16.04 or 18.04 :

   deb http://nginx.org/packages/ubuntu/ xenial nginx 
   deb-src http://nginx.org/packages/ubuntu/ xenial nginx
   

   After that update

    sudo apt-get update

   Command stop and show strings like that:

   GPG error: http://nginx.org <name package> Release: The following signatures couldn’t be verified because the public key is not available: NOPUBKEY ABF5BD8xxxxxxx

   Don’t worry add this key

   

   wget -q "http://nginx.org/packages/keys/nginx_signing.key" -O-| sudo apt-key add -
   

   repeat

   sudo apt-get update

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