■スラッシュドット
過労死Linuxが登場
　http://slashdot.jp/linux/article.pl?sid=10/10/31/0454246

学校用に設計されたサーバOSだそうです。
KAROSHI Linux Based OS
　http://karoshi.linuxgfx.co.uk/

Ubuntuベースですね。DocumentationのPDFをみると２００４年から開発がはじまってたみたい。
そうそう、スラドにもありますが、ドキュメントの６１ページ（FAQ)にこのように書いてあります。

What does Karoshi mean?

Karoshi means 'death by overwork' in Japanese.We stumbled across the name and it's meaning, from a British newspaper in a column about unusual words.We thought it would be ironic, as we know how hard teachers and system administrators work in schools.We thought as the operating system was designed to take the hard work out of running Linux servers in schools, that it would mean our user wouldn't 'die from overwork' or as we took it to mean get over exhausted/stressed. It has never been our aim to offend those who have died from this condition and it was more of a lighthearted poke of how overworked and stressful it can be to run servers in schools.