The Last.fm playcount synchronization plugin for Rhythmbox fetches the currently playing track's playcount from Last.fm, and updates your Rhythmbox database accordingly.
The Last.fm username is read from Rhythmbox' Last.fm plugin.
To install the plugin for the current user only, run the install script with
./install.sh
Note that you will still need root (sudo) access in order to install the correct dconf schema.
To install system-wide (for all users), run this script as root with
sudo ./install.sh
After installing the plugin in one of the two ways mentioned above, start up Rhythmbox, and head over to the Edit > Plugins menu. Check the box next to Last.fm playcount synchronization.
Make sure that you also have the regular "Last.fm" plugin enabled, since your Last.fm credentials stored in this plugin are used by the Last.fm playcount synchronization plugin to get the correct playcounts.
Plugin created by Bram Bonné <bram.bonne at gmail dot com> Bug reports and suggestions welcome at Github