I am using Ubuntu 18.04.1 LTS (updated 2 days ago from 16). The resolution was fine, but accidentally it changed to 1024x768 (4:3) and every time when i am trying to change to 1920x1080 (or any other size) it not accepted and return to 1024x768 (4:3). Please help me, thank you.
Tried several times, restarted pc, but no changes applied. Please help:)
Edit: Added screen from the terminal with existing resolutions: Terminal