Reconfiguring the screen in Ubuntu

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Spanish - detected to English translation

 well, I'll quote the steps to configure the screen in Ubuntu
First we need to use this command:

sudo dpkg-reconfigure xserver-xorg

Then, we need to  edit this file to create the configuration

sudo gedit /etc/X11/xorg.conf

when you open the text file section replacement monitor to the bottom of everything with this text

Section "Monitor"
Identifier "Generic Monitor"
Option "DPMS"
HorizSync 30-71
VertRefresh 50-65
EndSection

Section "Screen"
Identifier "Screen0"
Device "Configured Video Device"
Monitor "generic Monitor"
DefaultDepth 24
SubSection "Display"
Viewport 0 0
Depth 24
Modes "1024x768" #Here you can use other size
EndSubSection
EndSection