I am running Xubuntu 12.10 on top of a Window 7 VirtualBox. My native resolution is 1366x768 on a 13 inch screen. Everything is too small for my eyes. I simply want to make everything bigger, and not just the fonts. This sounds simple to me but I have searched for hours and been unsuccessful.

Is this possible at all? I tried to use xrandr. Is it right to try to set something in X as opposed to Xfce? And if so is xrandr the right tool?

In any case it did not work. I can do "xrandr -s 1024x768" to change the resolution, but if I do "xrandr --dpi 120" or "xrandr --dpi 120 1366x768" nothing happens and nothing is output on the console. The output of "xrandr -q" is as below. Could the problem be VirutalBox related?

1366x768 60.0*+
1600x1200 60.0
1440x1050 60.0
1280x960 60.0
1024x768 60.0
800x600 60.0
640x480 60.0

Many thanks for any help.