Laptop keyboard issue – some of the keys don't work

No. First check your keyboard booting up your laptop to BIOS.
If it would work well than your hardware is OK.

Then run

sudo dpkg-reconfigure keyboard-configuration

on terminal and choose appropriate keybord Acer V3 should be on the list.

Regards,
Boda

Since everything works with a USB keyboard, it is definitely a hardware issue. The first thing you should try is to remove the keyboard. Consult your manual or Acer's website for support on how to do so. Once it is removed, used canned air and blow air in between the keys. This may dislodge some debris that might be preventing the keyboard from working properly. Reattach the keybaord's ribbon cable to the motherboard and test if it works normally. If it does not, then you need to replace the keyboard, as some part of it is broken. You should be able to get a replacement from Acer. If it does work normally, then put it back in the case and close it up. If it stops working in the case, then it could be the case is flexing the keyboard enough to cause an issue. If thats the problem, then you would have an issue thats harder to fix. Acer would be able to replace the case, probably at cost if its not under warranty.