How to solve screen resolution problem in Ubuntu

X Rezise and Rotare (xrandr) is a utility available in your Linux  system for reseting and resizing your screen resolution. It is a command line utility. so if your display disapperaed ?? No problem you can do it from a Terminal (Press Ctrl+Alt+f1).

First You have to find the possible resolutions with  xrandr -q

$ xrandr -q
Screen 0: minimum 320 x 200, current 1024 x 768, maximum 1024 x 1024
VGA connected 1024×768+0+0 (normal left inverted right x axis y axis) 270mm x 200mm
1024×768 60.0*
800×600 85.1 75.0
640×480 85.0 85.0 75.0 59.9
720×400 70.1

Now you can set your resolution with command
$ xrandr -s 1024×768

More Details
$ man xrandr


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