As the Debian project releases a second update of its Debian GNU/Linux 5.0 ("Lenny") distribution, a controversy has broken out over the next version, "Squeeze." GNU guru Richard Stallman has warned that by including a Mono-based note-taking application called Tomboy, Debian runs the risk of Microsoft litigation over C# patents. Debian forms the basis for a number of desktop and embedded Linux distributions, including Ubuntu and Xandros. The second stable release, made available this week, is said to include numerous security fixes, as well as "a few adjustments to serious problems." But, the upcoming Squeeze release appears to have some serious problems, according to Debian insiders.