[ubuntu] 12.04 desktop has no keyboard focus

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http://ubuntuforums.org – After upgrading, the unity desktop does not get keyboard focus. Click on a desktop icon, it receives mouse focus, and the icon text clears. F2 or delete key have no effect. Select Rename from context menu, and types text goes to whatever app window already had focus. 11.04 had been working fine. I upgraded yesterday to 11.10, after which this problem began. Upgraded that to 12.04 today, and the problem persists. How can I fix this please? (Hardware)