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Taking into account the Debian policy, LTSP uses the following calver versioning scheme:

  • 20.04: a typical upstream release in April 2020
  • 20.04.2: additional releases within the same month add a counter
  • 20.04.10: rarely, maintenance upstream releases for older LTSP versions may be needed when grave bugs are backported or security issues are discovered; since these will be kept in separate repositories, they can just bump that month's counter, or use "+"

Distribution package versioning should be separated with a hyphen "-" or tilde "~":

  • 20.04-3: the third Debian packaging of the 20.04 release
  • 20.04-3ubuntu1: an Ubuntu-patched version of the aforementioned Debian package
  • 20.04-1~ubuntu20.04.1: an LTSP stable PPA build; debian/changelog contains the released version
  • 20.04-1+ubuntu20.04.1: an LTSP proposed PPA build; debian/changelog contains the older version

Note: the YYYY.MM scheme was also considered, but it's longer, and YY.MM can easily be upgraded to YYYY.MM or to YYMM, but not the opposite.