Flash is no longer being developed for Linux, and the newest versions are only available built-in to Chrome. If you use the Chromium browser, you can extract the Flash plugin from Chrome and use it. If you use Firefox, you'll need to...
Method 2 of 3:
Chrome

Method 3 of 3:
Firefox


Click CTRL + ALT + T at the same time- OR press "Super" key (windows key) and type in "Terminal." Launch it "Terminal". You should see a terminal.

Type "sudo apt-get install flashplugin-installer"

Type in your administrative password for sudo. You cannot view asterisks on the screen, but you're still typing it.

Install the plugin by pressing "Y" (yes) on Terminal.

Restart Firefox for the new plugin to take effect.

Update 04 March 2020
ncG1vNJzZmismaXArq3KnmWcp51ktbDDjK2mZqGeqMGiuMtmnaWZo516sbjAspyrZZ%2Bjerau1Kerrg%3D%3D