As the leader of the Ubuntu Project, Canonical knows Ubuntu inside out.

Working with a close-knit team from the open-source community, Canonical is responsible for delivering six-monthly Ubuntu releases, as well as co-ordinating security, trouble-shooting and providing an online platform for community interaction.

The number-one provider of Ubuntu services, Canonical works closely with businesses and individuals alike. Canonical also develops bespoke systems, provides comprehensive support and all the training that’s necessary to get everybody up and running and support the millions of Ubuntu users around the world.

http://www.ubuntu.com/