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I was thinking about buying a Raspberry Pi, and running Ubuntu on it. I have looked around the web, and a lot of stuff says that it's difficult for it to work on ARM processors. Has anyone figured out how to get a Raspberry pi to run Ubuntu?

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From the Official FAQ Page at Raspberry Pi:

What Linux distros will be supported at launch?

Fedora, Debian and ArchLinux will be supported from the start. We hope to see support from other distros later. (Because of issues with newer releases of Ubuntu and the ARM processor we are using, Ubuntu can’t commit to support Raspberry Pi at the moment.) You will be able to download distro images from us as soon as the Raspberry Pi is released, and we will also be selling pre-loaded SD cards shortly after release.

Source: My answer on Raspberry Pi SE

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Thanks. I hope they make it work for the Raspberry pi soon. I know a lot of people would be in favor of that. – Jordan Nov 6 '12 at 16:26
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Or they will move on to a board that supports it. cubieboard.org – mateo_salta Feb 1 at 0:54
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Currently not - Canonical only support ARM's ARMv7 processor architecture and the Pi has an ARMv6 chip.

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The complications you refer to regarding ARM are a common issue for all distributions, they are not Ubuntu-specific. They stem from the fact that ARM has a number of different architectures, offering limited to no compatibility between each other.

The leading Linux ARM distributions are the following (excluding Gentoo which by definition is compiled to the exact target), and I am listing the corresponding target architecture:

Ubuntu: ARMv7 and up, thumb 2 (32 bit)
Debian: ARMv4t and up (armel) ARMv7 and up (armhf)
Fedora: ARMv5tel (arm) ARMv7hl (armhf)
Arch Linux: ARMv5te or higher

To your specific question, the Raspberry PI runs a BCM2835 (ARM1176JZF-S) Broadcom CPU. This is armv6k architecture, which is not compatible with recent builds of Ubuntu, which are optimized for performance at the expense of compatibility with older chip designs like this Broadcom's.

The obvious choice is to run the armel architecture of Debian -- you will feel almost at home as if you were on Ubuntu.

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