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# Release 24.05 (“Uakari”, 2024.05/??) {#sec-release-24.05}
Support is planned until the end of December 2024, handing over to 24.11.
## Highlights {#sec-release-24.05-highlights}
In addition to numerous new and upgraded packages, this release has the following highlights:
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- `screen`'s module has been cleaned, and will now require you to set `programs.screen.enable` in order to populate `screenrc` and add the program to the environment.
- NixOS now installs a stub ELF loader that prints an informative error message when users attempt to run binaries not made for NixOS.
- This can be disabled through the `environment.stub-ld.enable` option.
- If you use `programs.nix-ld.enable`, no changes are needed. The stub will be disabled automatically.
## New Services {#sec-release-24.05-new-services}
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- [Guix](https://guix.gnu.org), a functional package manager inspired by Nix. Available as [services.guix](#opt-services.guix.enable).
- [maubot](https://github.com/maubot/maubot), a plugin-based Matrix bot framework. Available as [services.maubot](#opt-services.maubot.enable).
- [Anki Sync Server](https://docs.ankiweb.net/sync-server.html), the official sync server built into recent versions of Anki. Available as [services.anki-sync-server](#opt-services.anki-sync-server.enable).
The pre-existing [services.ankisyncd](#opt-services.ankisyncd.enable) has been marked deprecated and will be dropped after 24.05 due to lack of maintenance of the anki-sync-server softwares.
- [Clevis](https://github.com/latchset/clevis), a pluggable framework for automated decryption, used to unlock encrypted devices in initrd. Available as [boot.initrd.clevis.enable](#opt-boot.initrd.clevis.enable).
## Backward Incompatibilities {#sec-release-24.05-incompatibilities}
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- The `power.ups` module now generates `upsd.conf`, `upsd.users` and `upsmon.conf` automatically from a set of new configuration options. This breaks compatibility with existing `power.ups` setups where these files were created manually. Back up these files before upgrading NixOS.
- `mkosi` was updated to v19. Parts of the user interface have changed. Consult the
[release notes](https://github.com/systemd/mkosi/releases/tag/v19) for a list of changes.
- `services.avahi.nssmdns` got split into `services.avahi.nssmdns4` and `services.avahi.nssmdns6` which enable the mDNS NSS switch for IPv4 and IPv6 respectively.
Since most mDNS responders only register IPv4 addresses, most users want to keep the IPv6 support disabled to avoid long timeouts.
- `networking.iproute2.enable` now does not set `environment.etc."iproute2/rt_tables".text`.
Setting `environment.etc."iproute2/{CONFIG_FILE_NAME}".text` will override the whole configuration file instead of appending it to the upstream configuration file.
`CONFIG_FILE_NAME` includes `bpf_pinning`, `ematch_map`, `group`, `nl_protos`, `rt_dsfield`, `rt_protos`, `rt_realms`, `rt_scopes`, and `rt_tables`.
## Other Notable Changes {#sec-release-24.05-notable-changes}
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- `addDriverRunpath` has been added to facilitate the deprecation of the old `addOpenGLRunpath` setuphook. This change is motivated by the evolution of the setuphook to include all hardware acceleration.
- Cinnamon has been updated to 6.0. Please beware that the [Wayland session](https://blog.linuxmint.com/?p=4591) is still experimental in this release.
- `services.postgresql.extraPlugins` changed its type from just a list of packages to also a function that returns such a list.
For example a config line like ``services.postgresql.extraPlugins = with pkgs.postgresql_11.pkgs; [ postgis ];`` is recommended to be changed to ``services.postgresql.extraPlugins = ps: with ps; [ postgis ];``;
- Programs written in [Nim](https://nim-lang.org/) are built with libraries selected by lockfiles.
The `nimPackages` and `nim2Packages` sets have been removed.
See https://nixos.org/manual/nixpkgs/unstable#nim for more information.
- `libass` now uses the native CoreText backend on Darwin, which may fix subtitle rendering issues with `mpv`, `ffmpeg`, etc.
- The Yama LSM is now enabled by default in the kernel, which prevents ptracing
non-child processes. This means you will not be able to attach gdb to an
existing process, but will need to start that process from gdb (so it is a
child). Or you can set `boot.kernel.sysctl."kernel.yama.ptrace_scope"` to 0.
- [Nginx virtual hosts](#opt-services.nginx.virtualHosts) using `forceSSL` or
`globalRedirect` can now have redirect codes other than 301 through
`redirectCode`.
- [](#opt-boot.kernel.sysctl._net.core.wmem_max_) changed from a string to an integer because of the addition of a custom merge option (taking the highest value defined to avoid conflicts between 2 services trying to set that value), just as [](#opt-boot.kernel.sysctl._net.core.rmem_max_) since 22.11.
- Gitea 1.21 upgrade has several breaking changes, including:
- Custom themes and other assets that were previously stored in `custom/public/*` now belong in `custom/public/assets/*`
- New instances of Gitea using MySQL now ignore the `[database].CHARSET` config option and always use the `utf8mb4` charset, existing instances should migrate via the `gitea doctor convert` CLI command.
- The `hardware.pulseaudio` module now sets permission of pulse user home directory to 755 when running in "systemWide" mode. It fixes [issue 114399](https://github.com/NixOS/nixpkgs/issues/114399).
- The `btrbk` module now automatically selects and provides required compression
program depending on the configured `stream_compress` option. Since this
replaces the need for the `extraPackages` option, this option will be
deprecated in future releases.
- QtMultimedia has changed its default backend to `QT_MEDIA_BACKEND=ffmpeg` (previously `gstreamer` on Linux or `darwin` on MacOS).
The previous native backends remain available but are now minimally maintained. Refer to [upstream documentation](https://doc.qt.io/qt-6/qtmultimedia-index.html#ffmpeg-as-the-default-backend) for further details about each platform.
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