Fixing Missing Icons in Ubuntu 11.04 Notification Area

Ubuntu 11.04 introduced a whitelist system for the notification area (systray). Only programs listed in the whitelist can display their icons in the notification area. Here is how to add applications so their icon will be shown.

First, install "dconf-tools" if they are not already installed.
sudo apt-get install dconf-tools

Type Alt-F2 and type "dconf-editor". Navigate to Desktop->Unity->Panel. Now you have two options: enable icons for all applications or just specific applications. To enable all applications, change the value of systray-whitelist to ['all']. For specific applications, add a comma and the application name in single quotes to the end of the list.

Finally, log out and then back in. Your icons should now show up in the notification area.