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My keyboard is messing up with me. i can click on z, x, c fine. and i can press Ctrl + s to save file, Ctrl + shift + d to duplicate line(Atom) without any problem. all keys works very fine.

But the strange thing is that i cannot use : Ctrl+z to undo or Ctrl+c to copy or Ctrl+x to cut. It does not show any warning or error.

It does that in all IDEs, Browsers and text editors.

even when i run top command in terminal i cannot use Ctrl+z or Ctrl+c to stop it.

i tried to follow this here but i got lost.

What can i do?

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    Can you edit to say if this is a laptop keyboard - and if so, what is the brand and model of the laptop - or if it is an external keyboard? – sourcejedi May 11 at 14:05
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    The command stty sane in the linked answer only helps inside a terminal, it will not affect the browser. So the problem it fixes is not the problem you have (or at least not the only problem :-). – sourcejedi May 11 at 14:09
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    It is probably quite difficult to work out your problem :-). What keyboard layout do you use - is it an American or British QWERTY layout, or something different? Are you able to try booting a Live media, what version is it and does it have the same problem? If you are dual-booting, do you have the same problem in Windows or not? – sourcejedi May 11 at 14:13
  • At a guess I'd hazard that your keyboard definition doesn't match the actual keyboard you're using. – roaima May 11 at 14:30
  • Did it used to work and now it stopped working, or has it never worked correctly on this install of Ubuntu? – sourcejedi May 11 at 14:46

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