Install Flash – Linux Player

Step 1: Add Canonical Partners Repository

Add this repository using the command:
sudo add-apt-repository "deb http://archive.canonical.com/ $(lsb_release -sc) partner"
Once the repository has been added, update apt index then proceed to install Adobe Flash Player on Ubuntu 18.04
sudo apt update
sudo apt -y upgrade

Step 2: Install Adobe Flash Plugin on Ubuntu 18.04

Now we can install Adobe Flash Player on Ubuntu 18.04 Desktop so that we can stream audio and Video content without issues on most websites. Execute the command:
sudo apt install adobe-flashplugin
We can also install a browser-plugin-freshplayer-pepperflash package by running:
sudo apt-get install browser-plugin-freshplayer-pepperflash

Step 2: Using Adobe Flash Plugin on Ubuntu 18.04

Once the installation is complete, you need to close all active sessions of your Web browser and restart the application. This will ensure that browser plugin is loaded. If you search for Adobe Flash on your Ubuntu search menu, you should be able to access it and configure to your liking.