Install the Flash plug-in
Flash is a plug-in for your web browser that allows you to watch videos and use interactive web pages on some websites. While HTML5, which is a more modern solution, is increasingly offered, there are still some websites which won't work without Flash.
If you do not have Flash installed, you will probably see a message telling you so when you visit a website that needs it. Flash is available as a free (but not open-source) download for most web browsers.
There are two kinds of plug-ins available:
NPAPI for Firefox and other Gecko-based web browsers
PPAPI for Chromium and other Blink-based web browsers including Opera and Vivaldi
The Google Chrome browser is shipped with Flash bundled, and does not need a plug-in.
flashplugin-installer
The flashplugin-installer package provides the NPAPI plug-in for Firefox. If you chose to install certain third-party software when you installed Ubuntu, flashplugin-installer is probably installed already. Otherwise you can install it and restart your browser.
adobe-flashplugin
The adobe-flashplugin package provides both the NPAPI and PPAPI plug-ins, i.e. it provides Flash for both Firefox and Chromium like web browsers.
Make sure that the Canonical Partner repository is activated.
Install the adobe-flashplugin package.
Restart your browser.
browser-plugin-freshplayer-pepperflash
Some features of the PPAPI plug-in, such as 3D acceleration and premium video DRM, are not available in the NPAPI plugin. If you use Firefox or some other Gecko-based browser and need those features, you can install the browser-plugin-freshplayer-pepperflash package. It's a wrapper which makes Firefox use the PPAPI plug-in.
Make sure that adobe-flashplugin is installed.
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Open a terminal window by pressing Ctrl+Alt+T and install the browser-plugin-freshplayer-pepperflash package:
sudo apt install browser-plugin-freshplayer-pepperflash
Restart your browser.