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After working for a while with Manipulate function and increasing the number of variables to be manipulated, keyboard stops working properly in the Notebook. It gets really crazy, mainly the keys Backspace, Space, Delete, Ctrl, Alt, Left, Right, Up and Down. For example, some times Backspace starts behaving as the Left Key, some times as Right, etc. all this randomly. I am running Mathematica for Linux, and I have had this issue with Ubuntu 13.04 and recently with Ubuntu 13.10 as well. This is not an issue related to my computer since outside Mathematica the keyboard works as usual.

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Googling "keyboard issues ubuntu" yields many problems with the latest releases. My guess is that this is probably not related to Mathematica. –  Sjoerd C. de Vries Dec 1 '13 at 15:52
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