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I was using 10.04, upgraded to 12.04 15 days before. My system specifications are:

512 MB Ram ( 2 slots each of 256 MB 184pin DDR DIMM RAM ) i686, AMD Athlon ( 1150 MHZ ), without graphics card.

I am a normal user. I want to upgrade my system ( I don't want to buy a new one ) to 2 GB RAM ( 1+1 GB). There is a slot for AGP3 graphics card. But Is Graphic card necessary for Ubuntu 12.04 ?

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Better way would be run /usr/lib/nux/unity_support_test -p to check if Unity 3d is supported by your system or not. – atenz Aug 25 '12 at 11:57
Sure.. Thanks.. It works – Abhishek Aug 25 '12 at 12:05

Most of the Motherboard comes with inbuilt Graphics Module, minimum though but enough to run Ubuntu / Linux based system. You mentioned slower system performance , it would be mostly due to RAM (DDR 1st version) as mentioned..

To check if your system supports Unity 3D run

 /usr/lib/nux/unity_support_test -p 

If result is positive , then continue with RAM upgrading , it will perform better for sure.

If you want more smoother performance consider Lubuntu or Xubuntu for less resource hungry Desktop Environment.

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You need one graphic card to run any operating system. Doesn't matter if it's built in, AGP, PCI, or whatever.

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There is always an integrated graphics processor which gives you a display. Some of these graphics card are capable of running ubuntu 3D.

It will be better if you create a live usd/disk of 12.04 and test in your system.

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I have already Installed Ubuntu 12.04 through DVD. It's working But little slow. Unity 2D – Abhishek Aug 25 '12 at 11:52
Check whether there is any additional drivers for it. Or post output of lspci | grep VGA – Web-E Aug 25 '12 at 11:56
So your computer has to have some graphic card built in. You should see if that graphic card can run Unity 3D like tijybba said – LnxSlck Aug 25 '12 at 12:17

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