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This is what I have an Intel® Celeron(R) CPU E3300 @ 2.50GHz × 2

What would be the best version?

I've installed Ubuntu 12.04 but it's very slow.

marked as duplicate by Rinzwind, Thomas Ward, Seth, Alvar, Avinash Raj Jan 29 '14 at 7:01

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You need a lightweight desktop environment, Unity is quite heavy. To avoid reinstalling the whole system, and save time, you can just install a new desktop environment. I would suggest you to install LXDE with the following command.

sudo apt-get install lxde

Once it is done, logout and login and choose lxde.

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First off it a bad time to be installing Ubuntu with a new LTS release just months away. As for lightweight Ubuntus go there are many options but I highly recommend the LXDE spins: Lubuntu and WattOS

I prefer WattOS, but at this time I would install Lubuntu because the current version of WattOS is EOL.

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