T’was decided that the default behavior for Unity’s launcher will be to appear only on the primary monitor in Ubuntu 12.04. For some reason, when I upgraded to 12.04 (beta) today, my setting was for the launcher to appear on ALL desktops. Not a fan of it on all desktops.

For those who want to change this setting, you’ll need to install the Compiz configuration manager.

> sudo aptitude install compizconfig-settings-manager

Once installed, run it.

1. Hover the Dash Home (Ubuntu icon on launcher)
2. Type in compiz and click on the CompizConfig Settings Manager icon that appears.
3. Select Desktop on the left.
4. Click on Ubuntu Unity Plugin on the right.
5. Select the Experimental tab and scroll all the way down.

The setting for where launchers appear is Launcher Monitors. As of today (2012/04/05), you can select either Primary Desktop or All Desktops.