sudo apt-get install 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 and restart your browser.
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
browser-plugin-freshplayer-pepperflashSome 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.
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.