This page summarizes Ubuntu releases and milestones for 2011.
¶ Releases and Versions
- Ubuntu 11.04 “Natty Narwhal” released on 2011-04-28.
- Ubuntu 11.10 “Oneiric Ocelot” released on 2011-10-13.
- Ubuntu releases in April and October, with LTS releases every two years in April.
- https://en.wikipedia.org/wiki/Ubuntu_version_history
- https://documentation.ubuntu.com/project/release-team/list-of-releases/