Some keys in the keyboard doesn’t work and touchpad is freezed after pressing comma

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I’m using ubuntu 20 on a dell laptop
Once I suspended my laptop and tried login again. But then the whole laptop freezed. So I forced it to shutdown by holding the power key. Since then the following problems have occurred with my laptop.

The “Enter” key doesn’t work
When the “comma” is pressed it is repeated until I press another key
After the (2)nd incident above, the touchpad is freezed (but buttons work. The cursor is still there)

I tried with following methods

Tried to unfreez cursor by restarting the desktop – No effect 🙁
the command sudo apt-get install –reinstall xserver-xorg-input-all – No effect 🙁

And I tested it on the boot options menu, In there also it(enter key) doesn’t work
Also I tried with an ubuntu live disk, The result is same
What should I do for this problem?
Is that a problem with a recent kernel update?

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Marisa

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