specification for S390 architecture ISO/IEC 23360-8-2:2021 Linux Standard Base (LSB) — Part 8-2: Core specification for S390X architecture ISO/IEC 23360-8-3:2021 Linux Standard Base (LSB) — Part 8-3: Desktop specification for S390X architecture ISO/IEC 23360 and ISO/IEC TR 24715 can be freely downloaded from ISO website. Reception While LSB was a standard and without a competitor, it was followed only by few Linux distributions. For instance, only 21 distribution releases (versions) were certified for LSB version 4.0, notably Red Flag Linux Desktop 6.0, Red Hat Enterprise Linux 6.0, SUSE Linux Enterprise 11, and Ubuntu 9.04 (Jaunty Jackalope); even fewer were certified for version 4.1. The LSB was criticized for not taking input from projects, most notably the Debian project, outside the sphere of its member companies. Choice of the RPM package format LSB specified that software packages should either be delivered as an LSB-compliant installer, or (preferably) be delivered in a restricted form of the RPM Package Manager format. This choice of package format precluded the use of other existing package formats not compatible with RPM. To address this, the standard did not dictate which package format the system must use for its own packages, merely that RPM must be supported to allow packages from third-party distributors to be installed on a conforming system. Limitations on Debian Debian included optional support for LSB early on, at version 1.1 in "woody" (3.0; July 19, 2002), 2.0 in "sarge" (3.1; June 6, 2005), 3.1 in "etch" (4.0; April 8, 2007), 3.2 in "lenny" (5.0; February 14, 2009) and 4.1 in "wheezy" (7; May 4, 2013). To use foreign LSB-compliant RPM packages, the end-user needs to use Debian's Alien program to transform them into the native package format and then install them. The LSB-specified RPM format had a restricted subset of RPM features—to block usage of RPM features that would be untranslatable to .deb with Alien or other package conversion programs, and vice versa, as each format has capabilities the other lacks. In practice, not all Linux binary packages were necessarily LSB-compliant, so while most could be converted between .rpm and .deb, this operation was restricted to a subset of packages. By using Alien, Debian was LSB-compatible for all intents and purposes, but according to the description of their lsb package, the presence of the package "does not imply that we believe that Debian fully complies with the Linux Standard Base, and should not