Install and link Adobe Flash to web browsers under Ubuntu and Linux Mint
By Armando Caussade, http://armandocaussade.org/
Version 1.1.  June 1, 2019.

Copyright © 2019 Armando Caussade.  Some rights reserved.
Creative Commons License BY-NC-ND 4.0.

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INTRODUCTION

Adobe Flash is a platform for online multimedia content that can be installed on all main operating systems, including Linux.  But be aware that (as of 2019) Adobe Flash is deprecated software, with an expected end-of-life of December 31, 2020, which means that you should install only if necessary. 

I devised this procedure on Ubuntu 16.04 and 18.04, and have later tested it on Linux Mint 18 and 19.  On Mint 19, I have successfully installed and used Adobe Flash under both the 32-bit and 64-bit system architectures.

Canonical offers a newer version of the Flash plugin package.  This package contains both the NPAPI plugin required for Firefox and the PPAPI plugin required for Chromium, so it should enable Flash support in all browsers on your system.  To install Flash you need to activate the "Canonical Partners" repository if it isn't already enabled.

PROCEDURE

1. To install Adobe Flash for Mozilla Firefox, we will use the NPAPI version of the Flash plugin.  Make sure you possess root-level oprivileges before starting this procedure.  To install on Ubuntu 18.04 and Linux Mint 19, open a terminal and run the following command:

   $ sudo apt-get -y install adobe-flashplugin

2. Enter your password and answer "y" if prompted to agree to the installation.  The Adobe Flash Player will now be installed.  

3. To install Adobe Flash for Chromium, we will use the PPAPI version of the Flash plugin (Pepper Flash), which is maintained by Google.  To install on Ubuntu 18.04 and Linux Mint 19, open a terminal and run the following command:

   $ sudo apt-get -y install pepperflashplugin-nonfree

4. The web browser (either Firefox or Chromium) will need to be restarted before it will see the Flash plugin and use it.

5. To update Adobe Flash, use *one* of the following commands, according to whether you installed the NPAPI or PPAPI version:

   $ sudo update-adobe-flashplugin --install
   $ sudo update-pepperflashplugin-nonfree --install

6. If you ever need to remove Adobe Flash and its associated files, use *one* of the following commands:

   $ sudo apt-get -y remove adobe-flashplugin
   $ sudo apt-get -y remove pepperflashplugin-nonfree

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