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As weird as it sounds, my 't' key works for login (it is part of my password) but once I am logged in it doesn't work in lower case in any app or at the command line. I have rebooted twice.

I am using a toshiba z835 ultrabook.

The keyboard know the key is being pressed - the backlight comes on and if I keep it pressed I see flickering indicating that's it's being detected, but no 't' appears.

Uppercase T is working ok! Plus when i put caps lock on and do shift-T I actually get a lower case 't' ! Obviously can't work normally with that.

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closed as too localized by izx, RobotHumans, Jjed, Jorge Castro, Tom Brossman Sep 9 '12 at 19:54

This question is unlikely to help any future visitors; it is only relevant to a small geographic area, a specific moment in time, or an extraordinarily narrow situation that is not generally applicable to the worldwide audience of the internet. For help making this question more broadly applicable, visit the help center.If this question can be reworded to fit the rules in the help center, please edit the question.

Probably some other application that you have recently installed is using 't' as a hotkey, I do not know how to check which application, but the behaviour that you are experiencing looks like this. – Benjamin Sep 8 '12 at 23:50
thanks, (+1) that clue led me to my answer below. – Michael Durrant Sep 9 '12 at 0:28
up vote 3 down vote accepted

I had remapped it by mistake in Ubuntu Tweaks.

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