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I just noticed a blue triangle icon on my 'Ubuntu' icon. What could it mean?

Blue triangle icon

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Does the picture you posted have the 'Start' icon? If so, where? – mikewhatever Aug 6 '11 at 6:07
@mikewhatever I think he's referring to the Ubuntu button in the upper-left, which would be roughly analogous to Windows's "Start" button. – Christopher Kyle Horton Aug 6 '11 at 8:06
I am sorry for that. I was really referring to the Ubuntu button in the upper-left. Can't figure out what to call it at that moment. – JohanSJA Aug 6 '11 at 8:11
up vote 25 down vote accepted

The little blue triangle is an indicator that shows when an application is requesting user attention (for instance, a dialogue pops up).

The triangle is in the corner, and indicates the direction/place that the user needs to move the cursor in order to reveal the auto-hidden Launcher.

See also:

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haha I thought it was a graphic artifact, a bug of some sort... You know like if the screen would be rounded up. – jokoon Aug 6 '11 at 22:58

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