Softlanding Linux System (SLS) was an early Linux distribution, founded by Peter McDonald in mid-1992. It was the first comprehensive Linux distribution, containing more than the Linux Kernel and basic utilities, but also early GNU/Linux features such as the X Window System and TCP/IP.
SLS was probably the most popular Linux distribution at the time, but was also viewed by the community as being buggy and poorly maintained. Two of the more well-known critics of SLS were Ian Murdock and Patrick Volkerding. Murdock's frustration with SLS lead him to create the Debian project, while Volkerding decided to fix the problems with SLS and eventually renamed his work Slackware.