Debian 9 "Stretch" released

In Stretch, the default MySQL variant is now MariaDB. The replacement of packages for MySQL 5.5 or 5.6 by the MariaDB 10.1 variant will happen automatically upon upgrade.Firefox and Thunderbird return to Debian with the release of Stretch, and replace their debranded versions Iceweasel and Icedove, which were present in the archive for more than 10 years.In addition, Debian GNU/Hurd also has a new release.