Hi, I have an inspiron 15 3567. I'm facing a strange problem. Some keys of the keyboard aren't working like "b","n", space key, down key, left key, right key. 

I have changed the keyboard but still, those specific keys are working. I'm using windows and Ubuntu with dual boot, and those keys don't work on each operating system, so I don't think that it will be a driver issue. On screen keyboard works fine.