I tested the OS before installing on my laptop (Lenovo IdealPad L340 Gaming) on a USB stick. Everything seems to work fine and I managed to connect to my home WiFi network and typed the password.
However, after opening Firefox I noticed that it doesn't write or even press Enter, even in other apps and notepads and terminal have the same issue, the shortcuts however, like Alt+Tab, are working fine - even the function keys like volume up/down.
I tried to open the on screen keyboard, but it didn't show up. And I tried to.
I found a solution, but i don't understand how it worked yet...
I have re flashed Ubuntu to the USB stick as GPT this time not as MBR. Now I'm typing this on Ubuntu :) i hope this helps anyone in the future