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I am using following command to change my screen resolution:

xrandr --newmode "1368x768_60.00"   85.25  1368 1440 1576 1784  768 771 781 798 -hsync +vsync
xrandr --addmode VGA1 1368x768_60.00
xrandr --output VGA1 --mode 1368x768_60.00

Now, which file do I need to edit so it will modify my screen resolution when I start up my Ubuntu PC?

NOTE: editing .xprofile isn't ideal since it's only per-user, not system-wide, and GDM/KDM doesn't existed on a vanilla 11.10 install, nor does xorg.conf

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The https://wiki.ubuntu.com/X/Config/Resolution :

There are several ways to make xrandr customizations permanent from session to session: a) .xprofile, b) kdm/gdm, c) xorg.conf.

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You can use a GUI frontend to Xrandr, for example ARandR.

ARandR is designed to provide a simple visual front end for XRandR. Relative monitor positions are shown graphically and can be changed in a drag-and-drop way.

enter image description here

To install it in Ubuntu:

sudo apt-get install arandr

Now your configuration will be stored and loaded within the startup

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