Configure Ubuntu monitor resolution

rmane@desktop:~$ xrandr

Screen 0: minimum 320 x 200, current 1024 x 768, maximum 8192 x 8192

VGA1 connected 1024x768+0+0 (normal left inverted right x axis y axis) 0mm x 0mm

   1024x768       60.0*

   800x600        60.3     56.2 

   848x480        60.0 

   640x480        59.9 

HDMI1 disconnected (normal left inverted right x axis y axis)

DP1 disconnected (normal left inverted right x axis y axis)

HDMI2 disconnected (normal left inverted right x axis y axis)

HDMI3 disconnected (normal left inverted right x axis y axis)

DP2 disconnected (normal left inverted right x axis y axis)

DP3 disconnected (normal left inverted right x axis y axis)

rmane@desktop:~$ cvt 1024 1024

# 1024x1024 59.83 Hz (CVT) hsync: 63.60 kHz; pclk: 86.50 MHz

Modeline "1024x1024_60.00"   86.50  1024 1088 1192 1360  1024 1027 1037 1063 -hsync +vsync

$xrandr --newmode <paste Modeline obtained in above command>

rmane@desktop:~$ xrandr --newmode "1024x1024_60.00"   86.50  1024 1088 1192 1360  1024 1027 1037 1063 -hsync +vsync

rmane@desktop:~$ xrandr --addmode VGA1 1024x1024_60.00

rmane@desktop:~$ xrandr --output VGA1 --mode 1024x1024_60.00

To make this resolution permanent.

Now open your .xprofile from gedit by the command

$ sudo gedit ~/.xprofile

Copy all the three commands which you typed in the Step 3, Step 4, Step 5 and paste it in this file which will be like

xrandr --newmode "1024x1024_60.00"   86.50  1024 1088 1192 1360  1024 1027 1037 1063 -hsync +vsync

xrandr --addmode VGA1 1024x1024_60.00

xrandr --output VGA1 --mode 1024x1024_60.00