unity-2d: Unity interface for non-accelerated graphics cards Details: USN-1463-2 fixed a bug in Unity 2D exposed by a recent Firefox update. It was discovered that the issue was only partially fixed on Ubuntu 11.04. When Thunderbird was started from the launcher, Thunderbird was still unable to obtain pointer grabs under certain conditions. This update fixes the problem. Original advisory Popup menus were not working in Thunderbird under Unity 2D when started from the launcher.