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I use Ubuntu 12.04 with Gnome3. Whenever I press backspace in terminal(no text to delete) it gives me a sound and blinks the screen. I disabled the sound using system settings -> Sound -> Sound Effects -> Alert volume -> off

But I don't know how to disable the blinking screen. How to disable it?

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As a workaround you can disable terminal bell from profile preference in gnome-terminal. But you won't hear sounds on error. – sagarchalise Apr 30 '12 at 8:00
has anyone able to solve this ? In fact its not just the terminal, same behavior is observed when ever there is error alert. – Rojan Apr 30 '12 at 17:17

Ok, i just fixed this. Switch off the Visual Alerts. Although gnome accesibility button showed it as off but some reason it was not synchronizing with universal access settings.

System settings -> Universal Access -> Hearing

Make sure Visual Alerts is off.

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