It seems to me a keyboard failure.
But let's see some logs, when the bug cames attach here
/var/log/Xorg.0.log
then run in a terminal
apport-collect -p xserver-xorg-input-keyboard 645842
Thanks
Fabio
** Package changed: ubuntu => xserver-xorg-input-keyboard (Ubuntu)
** Changed in: xserver-xorg-input-keyboard (Ubuntu)
Status: Incomplete => New
** Changed in: xserver-xorg-input-keyboard (Ubuntu)
Status: New => Incomplete
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Sometimes CTRL key becomes logically stuck
https://bugs.launchpad.net/bugs/645842
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