I just upgraded from 16.04. When the LiveCD was running it showed the desktop screen that filled the entire monitor screen. After my installation of 18.04 there is black empty space at the top, bottom, left and right of the screen outside of the desktop screen. I searched the forum and didn't find a solution. I tried changing the resolution with terminal commands using this tutorial without success at http://ubuntuhandbook.org/index.php/2017/04/custom-screen-resolution-ubuntu-desktop
In The terminal, I typed xrandr and it says:
DVI-D-1 connected primary 1680x1050+0+0 (normal left inverted right x axis y axis) 474mm x 296mm
I tried setting the NVIDIA graphics driver to one that is proprietary, tested but nothing has changed.
My monitor is an old samsung SyncMaster 220wm. Is there something I can do to fix this problem or do I need to replace the monitor?