After upgrading to Ubuntu 18.04, display is like zoomed
Solution 1:
I had the same problem, but figure it out that Zoom was active. Just go to Universal Access in Settings and disable Zoom.
Hope it helps.
Solution 2:
I have nvidia GeoForce GTX 1080 graphics card.
I went to Software & Updates
and then to the Additional Drivers
tab and selected what is given in the below image. It installed the drivers after which I rebooted and it was fine.