# Release 14.04 ("Baboon", 2014/04/30) {#sec-release-14.04}

This is the second stable release branch of NixOS. In addition to numerous new and upgraded packages and modules, this release has the following highlights:

- Installation on UEFI systems is now supported. See [](#sec-installation) for details.

- Systemd has been updated to version 212, which has [numerous improvements](http://cgit.freedesktop.org/systemd/systemd/plain/NEWS?id=v212). NixOS now automatically starts systemd user instances when you log in. You can define global user units through the `systemd.unit.*` options.

- NixOS is now based on Glibc 2.19 and GCC 4.8.

- The default Linux kernel has been updated to 3.12.

- KDE has been updated to 4.12.

- GNOME 3.10 experimental support has been added.

- Nix has been updated to 1.7 ([details](https://nixos.org/nix/manual/#ssec-relnotes-1.7)).

- NixOS now supports fully declarative management of users and groups. If you set `users.mutableUsers` to `false`, then the contents of `/etc/passwd` and `/etc/group` will be [congruent](https://www.usenix.org/legacy/event/lisa02/tech/full_papers/traugott/traugott_html/) to your NixOS configuration. For instance, if you remove a user from `users.extraUsers` and run `nixos-rebuild`, the user account will cease to exist. Also, imperative commands for managing users and groups, such as `useradd`, are no longer available. If `users.mutableUsers` is `true` (the default), then behaviour is unchanged from NixOS 13.10.

- NixOS now has basic container support, meaning you can easily run a NixOS instance as a container in a NixOS host system. These containers are suitable for testing and experimentation but not production use, since they're not fully isolated from the host. See [](#ch-containers) for details.

- Systemd units provided by packages can now be overridden from the NixOS configuration. For instance, if a package `foo` provides systemd units, you can say:

  ```nix
  {
    systemd.packages = [ pkgs.foo ];
  }
  ```

  to enable those units. You can then set or override unit options in the usual way, e.g.

  ```nix
  {
    systemd.services.foo.wantedBy = [ "multi-user.target" ];
    systemd.services.foo.serviceConfig.MemoryLimit = "512M";