Debian 5.0, also known by its release name Lenny, was a version of the Debian Linux operating system released in 2009. Its shutdown sound was one of the small system audio cues bundled with the desktop experience, designed to confirm that the machine was closing down cleanly. Short clips like this later circulated on soundboards and in retro computing videos, where they are recognised less for their musical quality than for their association with an earlier era of open-source desktop computing.