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When I run xrandr I have this output:

barsoom@ubuntu:/etc/xdg/lxsession/Lubuntu$ sudo xrandr
xrandr: Failed to get size of gamma for output default
Screen 0: minimum 640 x 480, current 1024 x 768, maximum 1024 x 768
default connected 1024x768+0+0 0mm x 0mm
   1024x768       75.0*    70.0     60.0  
   800x600        75.0     72.0     60.0     56.0     65.0  
   640x480        75.0     73.0     67.0     60.0  

How do I change it higher than what's available? I need to set it to the resolution of my monitor, 1440x900 because everything looks so big.

What I Tried:

these command:

xrandr --addmode VGA1 1440x900
xrandr: Failed to get size of gamma for output default
xrandr: cannot find output "VGA1"
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Try this:

sudo xrandr --addmode default 1440x900
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