Comment 4 for bug 1876503

Thank you for taking the time to report this bug and helping to make Ubuntu better.

Bug reporting is mostly about finding & fixing problems thus preventing future users from hitting the same bug.

I suspect a Support site would be more appropriate, eg. https://answers.launchpad.net/ubuntu. You can also find help with your problem in the support forum of your local Ubuntu community http://loco.ubuntu.com/ or asking at https://askubuntu.com or https://ubuntuforums.org, or for more support options please look at https://discourse.ubuntu.com/t/community-support/709

For example, you provided no clues as to if any keyboard functions work, does it include trying to switch to a text terminal (ctrl+alt+f4), commands given directly to kernel (ie. to kill your GUI, reboot etc). I get the feeling your issue maybe just thrashing, or if you don't have swap enabled, enabling swap may reduce your issue significantly.. These are areas that support can help with, or if they've already been attempted, those issues mentioned as making no change, or issue remains for each thing tried.

(depending on how your keyboard is powered; I'd also check your hardware including power-supply)