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I just notice that the icons in the launcher are all missing. The launcher is there, but it is empty. Now I have to use Alt+Tab to switch between opened applications. I don't know what happened. I am just opening a lot of chrome tabs. Can someone help me with it?

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Are you using intel graphics? This may be an annoying bug that was only recently fixed in February in the precise-updates repository. See:

https://bugs.launchpad.net/ubuntu/+source/mesa/+bug/1024768

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