The above instructions worked flawlessly on an old 1st gen I had laying around that I re-purposed. Once you have Ubuntu running you can use the standard 32bit Splunk installer. Considering the 1st gen ATV only has 256mb of RAM and and a 1Ghz Intel processor I hope you don't expect much performance. I believe there was a 40Gb and 160Gb hard drive model. If you have a 40Gb model space may become an issue.