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When I go to Universal Access -> Hearing tab -> turn Visual Alerts on and try Test Flash with either the option to flash the window title or to flash the entire screen, nothing happens.

Also, see my related question about audio alerts.

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I have the same problem with 12.04 32 bits, could you add the 12.04 tag? – qwertzguy Mar 15 '13 at 14:05
I have the same problem with Ubuntu 14.04 – Flimm Dec 2 '14 at 23:35
Subject to a bug report -… – fossfreedom Dec 2 '14 at 23:48
If it was up to me everyone on AskUbuntu should tick the "I am affected too" on the [bug fossfreedom mentions in comment. Seems to me that bug does not get the attention it should get. – Rinzwind Dec 7 '14 at 9:08

As of Ubuntu switching to Unity ("3D") none of the universal access visual effects have been working.

Besides waiting for it to get resolved the only answer to this question at the moment is to use a version that does not use Unity. That would be Ubuntu gnome; or the still unofficial Ubuntu Mate. lUbuntu, xUbuntu, kUbuntu might be an option. Some will have different tool sets for universal access though.

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