from: https://en.wikipedia.org/wiki/Ubuntu "Ubuntu is a Linux distribution based on Debian and composed mostly of free and open-source software. Ubuntu is officially released in multiple editions: Desktop, Server, and Core for Internet of things devices and robots. Wikipedia"
Package Manager
Ubuntu uses APT
Ubuntu Versions
Each Ubuntu version is based on a Debian version. You can see with /etc/debian_version
From: https://askubuntu.com/questions/445487/what-debian-version-are-the-different-ubuntu-versions-based-on
|Ubuntu|Debian| |---|---| |22.10 kinetic|bookworm/ sid - 12| |22.04 jammy|bookworm/ sid| |21.10 impish|bullseye/ sid - 11| |21.04 hirsute|bullseye/ sid| |20.10 groovy|bullseye/ sid| |20.04 focal|bullseye/ sid| |19.10 eoan|buster / sid - 10| |19.04 disco|buster / sid| |18.10 cosmic|buster / sid| |18.04 bionic|buster / sid| |17.10 artful|stretch / sid - 9| |17.04 zesty|stretch / sid| |16.10 yakkety|stretch / sid| |16.04 xenial|stretch / sid| |15.10 wily|jessie / sid - 8| |15.04 vivid|jessie / sid| |14.10 utopic|jessie / sid| |14.04 trusty|jessie / sid| |13.10 saucy|wheezy / sid - 7| |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 - 6| |10.10 maverick|squeeze / sid| |10.04 lucid|squeeze / sid|
- Sid is the development distribution of Debian. That's how, for example, Ubuntu 20.04, released in April 2020, can be based on Debian 11 "Bullseye", which was released in August 2021.*