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I'm on Ubuntu 16.10 (but appear in 15..).

Apparently without a motivation, my laptop key 5 being repeatedly entered into it as if I am holding down the 5 key.

When I press a key on the keyboard (any key) it stops.

I have no idea how to debug this or what may be causing it.

The same issue is on this post:

The 5 key is being held down by a ghost?

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    Have you tried another KB as suggest in the other post? Another idea with the power off try gently lifting end depressing the 5 key - possibly take some canned air and blow around and underneath the key – pfeiffep May 15 '16 at 17:24
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You seem to have wireless Logitech keyboard, right? There was a Linux kernel bug (not just Ubuntu distribution). It is already fixed with kernel version 4.4.0-30.49.

So you can just update your system with Software Updater for example.

You can find more information here https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1579190

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