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I'm trying to install Ubuntu 12.04, via CD and USB. When I put them on my laptop computer, It shows the following:

This Kernel requires the following features not present on the CPU : PAE
Unable to boot - Please use a kernel appropriate for your CPU.

My Laptop's specifications: CPU : Intel Pentium M 725 1.6GHz VGA : Geforce FX Go5200 64MB RAM : 1GB DDR

It is an older machine.

My question is, why is this error appearing and how to I solve it?

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up vote 1 down vote accepted

Your CPU doesn't support PAE.

In computing, Physical Address Extension (PAE) is a feature to allow 32-bit x86 processors to access a physical address space (including random access memory and memory mapped devices) larger than 4 gigabytes. (wikipedia)

The easiest way to install ubuntu with unity is to download and burn the mini.iso, you can get 12.04 or one of the other mini.iso's here:

Boot from it and follow the instructions, choose the latest linux-generic (without PAE) kernel (if you're asked to choose one, this depends on the choice you make how to install), and choose ubuntu-desktop when you are asked to select software to install. Do choose a desktop, if you don't you'll end up with a command-line system without a gui.

You might also consider to install Xubuntu or Lubuntu 12.10 because you are using an older laptop, Xubuntu or Lubuntu are more lightweight than Ubuntu and thus work faster. I recommend Lubuntu for speed.

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Exactly what he said. – Wolfer Jan 24 '13 at 14:42
But when I boot another version of linux, Xubuntu, or like Backtrack5, monitor was cracked, then I couldn't longer proceed with the installation. – Sang Hyeok Lee Jan 24 '13 at 14:56
I don't know what "monitor was cracked" means, but it sounds like a nvidia-driver problem. Try out the mini.iso installation, if you choose lubuntu-desktop instead of ubuntu-desktop you'll get lubuntu. If it doesn't work ask another question and describe in detail what exactly happens. – jeroen Jan 24 '13 at 15:46

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