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1st chunk of `nixos/doc/manual/release-notes/rl-2009.section.md`
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# Release 20.09 ("Nightingale", 2020.10/27) {#sec-release-20.09}

Support is planned until the end of June 2021, handing over to 21.05. (Plans [ have shifted](https://github.com/NixOS/rfcs/blob/master/rfcs/0080-nixos-release-schedule.md#core-changes) by two months since release of 20.09.)

## Highlights {#sec-release-20.09-highlights}

In addition to 7349 new, 14442 updated, and 8181 removed packages, this release has the following highlights:

- Core version changes:

  - gcc: 9.2.0 -\> 9.3.0

  - glibc: 2.30 -\> 2.31

  - linux: still defaults to 5.4.x, all supported kernels available

  - mesa: 19.3.5 -\> 20.1.7

- Desktop Environments:

  - plasma5: 5.17.5 -\> 5.18.5

  - kdeApplications: 19.12.3 -\> 20.08.1

  - gnome3: 3.34 -\> 3.36, see its [release notes](https://help.gnome.org/misc/release-notes/3.36/)

  - cinnamon: added at 4.6

  - NixOS now distributes an official [GNOME ISO](https://nixos.org/download.html#nixos-iso)

- Programming Languages and Frameworks:

  - Agda ecosystem was heavily reworked (see more details below)

  - PHP now defaults to PHP 7.4, updated from 7.3

  - PHP 7.2 is no longer supported due to upstream not supporting this version for the entire lifecycle of the 20.09 release

  - Python 3 now defaults to Python 3.8 instead of 3.7

  - Python 3.5 reached its upstream EOL at the end of September 2020: it has been removed from the list of available packages

- Databases and Service Monitoring:

  - MariaDB has been updated to 10.4, MariaDB Galera to 26.4. Please read the related upgrade instructions under [backwards incompatibilities](#sec-release-20.09-incompatibilities) before upgrading.

  - Zabbix now defaults to 5.0, updated from 4.4. Please read related sections under [backwards compatibilities](#sec-release-20.09-incompatibilities) before upgrading.

- Major module changes:

  - Quickly configure a complete, private, self-hosted video conferencing solution with the new Jitsi Meet module.

  - Two new options, [authorizedKeysCommand](options.html#opt-services.openssh.authorizedKeysCommand) and [authorizedKeysCommandUser](options.html#opt-services.openssh.authorizedKeysCommandUser), have been added to the `openssh` module. If you have `AuthorizedKeysCommand` in your [services.openssh.extraConfig](options.html#opt-services.openssh.extraConfig) you should make use of these new options instead.

  - There is a new module for Podman (`virtualisation.podman`), a drop-in replacement for the Docker command line.

  - The new `virtualisation.containers` module manages configuration shared by the CRI-O and Podman modules.

  - Declarative Docker containers are renamed from `docker-containers` to `virtualisation.oci-containers.containers`. This is to make it possible to use `podman` instead of `docker`.

  - The new option [documentation.man.generateCaches](options.html#opt-documentation.man.generateCaches) has been added to automatically generate the `man-db` caches, which are needed by utilities like `whatis` and `apropos`. The caches are generated during the build of the NixOS configuration: since this can be expensive when a large number of packages are installed, the feature is disabled by default.

  - `services.postfix.sslCACert` was replaced by `services.postfix.tlsTrustedAuthorities` which now defaults to system certificate authorities.

  - The various documented workarounds to use steam have been converted to a module. `programs.steam.enable` enables steam, controller support and the workarounds.

  - Support for built-in LCDs in various pieces of Logitech hardware (keyboards and USB speakers). `hardware.logitech.lcd.enable` enables support for all hardware supported by the [g15daemon project](https://sourceforge.net/projects/g15daemon/).

  - The GRUB module gained support for basic password protection, which allows to restrict non-default entries in the boot menu to one or more users. The users and passwords are defined via the option `boot.loader.grub.users`. Note: Password support is only available in GRUB version 2.
Title: NixOS Release 20.09 "Nightingale" Highlights
Summary
NixOS Release 20.09, codenamed "Nightingale," was released on October 27, 2020, with support planned until June 2021. This release features 7349 new, 14442 updated, and 8181 removed packages. Key updates include core version changes (e.g., gcc 9.3.0, glibc 2.31, mesa 20.1.7), desktop environment upgrades (plasma5 5.18.5, gnome3 3.36, new Cinnamon 4.6, and an official GNOME ISO), and programming language updates (PHP defaults to 7.4, Python 3 defaults to 3.8). Databases like MariaDB and Zabbix have been updated to 10.4 and 5.0 respectively. Significant module changes include a new Jitsi Meet module, new `openssh` options, a new Podman module and related container management, a `man-db` cache generation option, a dedicated Steam module, Logitech LCD support, and GRUB password protection.