Based on the answer 445496 to the askbuntu question What Debian version are the different Ubuntu versions based on?
- 18.04 bionic buster / sid
- 17.10 artful stretch / sid
- 17.04 zesty stretch / sid
- 16.10 yakkety stretch / sid
- 16.04 xenial stretch / sid
- 15.10 wily jessie / sid
- 15.04 vivid jessie / sid
- 14.10 utopic jessie / sid
- 14.04 trusty jessie / sid
- 13.10 saucy wheezy / sid
- 13.04 raring wheezy / sid
- 12.10 quantal wheezy / sid
- 12.04 precise wheezy / sid
- 11.10 oneiric wheezy / sid
- 11.04 natty squeeze / sid
- 10.10 maverick squeeze / sid
- 10.04 lucid squeeze / sid