How to Install Oracle 12c R2 Database on Ubuntu 18.04 64-bit

Making Network Configuration

6. 6. Making Network Setup

   Next Make Network Configuration.

   First, Get hostname with:

   hostname

   And to Get IP:

   /sbin/ifconfig

   You will Find it Under the lo >> inet Section.

   Check if Hostname is Already into the Enabled Hosts File:

   cat /etc/hosts

   If It’s Not Present then Insert it with:

   sudo nano /etc/hosts

   Insert: [ip] [HOSTNAME] as here below.
   Example for a Local Setup: ‘127.0.0.1 localhost.localdomain’
   Ctrl+Shift+c to Copy from Shell.
   Ctrl+Shift+v to Paste Content into nano
   Finally, Ctrl+x to Save and Exit from nano Editor :)

   Again to Grant Connection to X Server do:

   sudo xhost +[myIP]

   Replace [myIP] with your actual one.
   Example: # xhost +127.0.0.1.