Graphics problem on Ubuntu 18.04 - blurred text + screen flickering
Solution 1:
To get rid of the flicker, I had to REMOVE these two lines from /etc/environment (you probably don't have them, unless you installed gnome-wobbly-windows extension)
CLUTTER_PAINT=disable-clipped-redraws:disable-culling
CLUTTER_VBLANK=True
And I also had to run sudo ubuntu-drivers autoinstall and then reboot
For nVidia cards:
To make the text non-blurry, I just increased the screen resolution via nvidia-settings (the Display dialog did not let me change the resolution)