In Ubuntu 14.04, other browsers can play video and music after installing the Adobe Flash plugin, but the Chromium browser will prompt for a missing Adobe Flash plugin.
Cause: Before chromium uses the Netscape Plugin API architecture to support Flash, starting with Ubuntu 14.04, chromium will stop using the Netscape Plugin API. This issue does not occur because other browsers are using Flash Player 11.2.
Workaround: To solve this problem, we can use pepper Flash Player, a more secure and stable version of Flash Player from Google. There are adobe Flash Player Pepper installers in the Ubuntu 14.04 source. This installer will download Google Chrome, extract the pepper Flash player and set it to chromium. To install Pepper Flash Player in Ubuntu 14.04, open a terminal and use the following command:
sudo apt-get install pepperflashplugin-nonfreesudo update-pepperflashplugin-nonfree--install
Then restart the chromium.
Ubuntu 14.04 under Chromium does not install Adobe Flash Player issue resolution