In addition to numerous new and upgraded packages, this release has the following highlights: Systemd has been updated to version 217, which has numerous improvements . Nix has been updated to 1.8. NixOS is now based on Glibc 2.20. KDE has been updated to 4.14. The default Linux kernel has been updated to 3.14. users.mutableUsers set to true now respect any changes made after initial creation of a user or a group. Following new services were added since the last release: parallels-guest docker lxc openvswitch fluxbox bspwm gdm fcgiwrap peerflix fail2ban chronos znc unifi teamspeak3 strongswan seeks radicale prosody polipo openntpd nsd mailpile i2pd dnscrypt-proxy consul atftpd scollector collectd bosun riemann zookeeper uhub siproxd redmine phd mesos gitlab gitolite etcd docker-registry cpuminer-cryptonight thermald mlmmj tcsd gnome3.seahorse gnome3.gvfs gnome3.gnome-online-miners gnome3.gnome-documents geoclue2 opentsdb neo4j monetdb influxdb hbase torque/mrom torque/server kubernetes fleet crashplan mopidy liquidsoap Following renames of options have taken in effect (old names are obsolete): fonts.enableFontConfig to fonts.fontconfig.enable fonts.extraFonts to fonts.fonts services.virtualbox.enable to services.virtualboxGuest.enable nix.proxy to networking.proxy.default hardware.opengl.videoDrivers to services.xserver.videoDrivers When upgrading from a previous release, please be aware of the following incompatible changes: The default version of Apache httpd is now 2.4. If you use the extraConfig option to pass literal Apache configuration text, you may need to update it — see Apache’s documentation for details. If you wish to continue to use httpd 2.2, add the following line to your NixOS configuration: services.httpd.package = pkgs.apacheHttpd_2_2; PHP 5.3 has been removed because it is no longer supported by the PHP project. A migration guide is available. The host side of a container virtual Ethernet pair is now called ve-container-name rather than c-container-name. GNOME 3.10 support has been dropped. The default GNOME version is now 3.12. VirtualBox has been upgraded to 4.3.20 release. Users may be required to run rm -rf /tmp.vbox*. imports = [ <nixpkgs/nixos/modules/programs/virtualbox.nix> ] is no longer necessary, use services.virtualboxHost.enable = true instead. Chromium has been updated to 39.0.2171.65. enablePepperPDF is now enabled by default. chromium*Wrapper packages no longer exist, because upstream removed NSAPI support. chromium-stable has been renamed to chromium. Python packaging documentation is now part of nixpkgs manual. To override the python packages available to a custom python you now use pkgs.pythonFull.buildEnv.override instead of pkgs.pythonFull.override. boot.resumeDevice = "8:6" is no longer supported. Most users will want to leave it undefined, which takes the swap partitions automatically. There is an evaluation assertion to ensure that the string starts with a slash. The system-wide default timezone for NixOS installations changed from CET to UTC. To choose a different timezone for your system, configure time.timeZone in configuration.nix. A fairly complete list of possible values for that setting is available at . GNU screen has been updated to 4.2.1, which breaks the ability to connect to sessions created by older versions of screen.