How do I install an equalizer in Rhythmbox?

As of 13/06/2012, this PPA seems to contain the latest version of the "10 Band Equalizer" (rhythmbox-plugin-equalizer) and its working great for me (on 12.04 and 14.04-64bit).

sudo add-apt-repository ppa:fossfreedom/rhythmbox-plugins
sudo apt-get update
sudo apt-get install rhythmbox-plugin-equalizer

Rhythmbox is not a canonical product so I don't think canonical can do anything about it. If you need a feature may be you can request feature to rhythmbox developers. If you are talking about third party plugin called 10 Band Equalizer.

What you can do is create a folder called plugins in $HOME/.local/share/rhythmbox and download the plugin and extract the equalizer folder in the plugins folder you created.

OR

If you know how to use git and have git installed. Just goto $HOME/.local/share/rhythmbox and do:

git clone https://github.com/luqmana/rhythmbox-plugins.git plugins

and then you can update your plugin with git pull command from plugins directory

Then enable the plugin from rhythmbox.

It can also be installed via a PPA as described in the linked question.

Linked Question: - How do I install third-party rhythmbox plugins?