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I installed ubuntu, but the screen size is very small 800x600.

I can't change the setting, what could be the issue?

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What card are you using? ATI/nVidia? as eleven81 said below, its most likely because the drivers for your graphics card are not installed. If you goto the nVidia site you can download the linux drivers as a .deb, try running that – James.Elsey Nov 24 '09 at 14:57
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3 Answers

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The correct drivers for your video card are probably not installed.

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I had this problem in ubuntu 9.10 in spite of having correct drivers.I was able to increase my resolution to 1028x following instructions given vide http://ubuntuforums.org/showthread.php?p=8302145#post8302145.You may also try.

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Try reconfiguring the X server. Open the terminal, type 

 sudo dpkg-reconfigure xserver-xorg

Logout & login or restart your system.

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