Correction: A recent update seems to have fixed it for me in 64-bit 12.04. For the first time today I was able to left click on the automatic Update Manager icon in Unity and it opened on the desktop. So I am no longer affected by this bug.
Correction: A recent update seems to have fixed it for me in 64-bit 12.04. For the first time today I was able to left click on the automatic Update Manager icon in Unity and it opened on the desktop. So I am no longer affected by this bug.