SparkyLinux 4.6 is the latest stable and most advanced version of the distro, which was in development for the past several months, based on the Debian Testing (Stretch) repositories. But now that the Debian GNU/Linux 9 “Stretch” operating system has hit stable, the SparkyLinux devs were quick to promote their OS to the stable channel too. Powered by the long-term supported Linux 4.9.30 kernel, SparkyLinux 4.6 “Tyche” is synced with the Debian GNU/Linux 9 “Stretch” operating system repositories as of June 19, 2017. It replaces the Icedove email client with Mozilla Thunderbird, adds a new theme called Sparky5 to improve the look of GTK+ apps, and two new boot options.