[Debian](https://debian.org/) is one of the oldest Linux distributions and the one with the most derivatives, including Ubuntu. Debian and its derivatives are [the most popular Linux distributions on web servers](https://w3techs.com/technologies/details/os-linux) across the Internet. The Debian project is coordinated over the Internet by a team of volunteers whose work is entirely public. All this makes Debian one of the Free Software projects under the most scrutiny by security researchers.