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I am newer to Ubuntu. Recently I bought Intel® Core™ i3-2120 CPU @ 3.30GHz (Intel HD Graphics 2000 display) with Dell IN2030M monitor. I installed Ubuntu 12.04 LTS version. My problem is, I can't change my screen resolution >1024 because the monitor was not detected, it says Unknown. Help please.

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You need to install at least the package mesa-utils.

On a console type:

sudo apt-get install mesa-utils

Logout and login

That will give you the basic graphic drivers, for advanced graphics you need to install Intel HD Graphics.

This has already been answered here and here

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