- After switching to the new system configuration you should run the Django
    management command to reindex your documents and optionally create a user,
    if you don't have one already.

    To do so, enter the data directory (the value of
    `services.paperless-ng.dataDir`, `/var/lib/paperless` by default), switch
    to the paperless user and execute the management command like below:

    ```
    $ cd /var/lib/paperless
    $ su paperless -s /bin/sh
    $ ./paperless-ng-manage document_index reindex
    # if not already done create a user account, paperless-ng requires a login
    $ ./paperless-ng-manage createsuperuser
    Username (leave blank to use 'paperless'): my-user-name
    Email address: me@example.com
    Password: **********
    Password (again): **********
    Superuser created successfully.
    ```

- The `staticjinja` package has been upgraded from 1.0.4 to 4.1.1

- Firefox v91 does not support addons with invalid signature anymore. Firefox ESR needs to be used for nix addon support.

- The `erigon` ethereum node has moved to a new database format in `2021-05-04`, and requires a full resync

- The `erigon` ethereum node has moved its database location in `2021-08-03`, users upgrading must manually move their chaindata (see [release notes](https://github.com/ledgerwatch/erigon/releases/tag/v2021.08.03)).

- [users.users.<name>.group](options.html#opt-users.users._name_.group) no longer defaults to `nogroup`, which was insecure. Out-of-tree modules are likely to require adaptation: instead of
  ```nix
  {
    users.users.foo = {
      isSystemUser = true;
    };
  }
  ```
  also create a group for your user:
  ```nix
  {
    users.users.foo = {
      isSystemUser = true;
      group = "foo";
    };
    users.groups.foo = {};
  }
  ```

- `services.geoip-updater` was broken and has been replaced by [services.geoipupdate](options.html#opt-services.geoipupdate.enable).

- `ihatemoney` has been updated to version 5.1.1 ([release notes](https://github.com/spiral-project/ihatemoney/blob/5.1.1/CHANGELOG.rst)). If you serve ihatemoney by HTTP rather than HTTPS, you must set [services.ihatemoney.secureCookie](options.html#opt-services.ihatemoney.secureCookie) to `false`.

- PHP 7.3 is no longer supported due to upstream not supporting this version for the entire lifecycle of the 21.11 release.

- Those making use of `buildBazelPackage` will need to regenerate the fetch hashes (preferred), or set `fetchConfigured = false;`.

- `consul` was upgraded to a new major release with breaking changes, see [upstream changelog](https://github.com/hashicorp/consul/releases/tag/v1.10.0).

- fsharp41 has been removed in preference to use the latest dotnet-sdk

- The following F#-related packages have been removed for being unmaintaned. Please use `fetchNuGet` for specific packages.

  - ExtCore
  - Fake
  - Fantomas
  - FsCheck
  - FsCheck262
  - FsCheckNunit
  - FSharpAutoComplete
  - FSharpCompilerCodeDom
  - FSharpCompilerService
  - FSharpCompilerTools
  - FSharpCore302
  - FSharpCore3125
  - FSharpCore4001
  - FSharpCore4117
  - FSharpData
  - FSharpData225
  - FSharpDataSQLProvider
  - FSharpFormatting
  - FsLexYacc
  - FsLexYacc706
  - FsLexYaccRuntime
  - FsPickler
  - FsUnit
  - Projekt
  - Suave
  - UnionArgParser
  - ExcelDnaRegistration
  - MathNetNumerics

- `programs.x2goserver` is now `services.x2goserver`

- The following dotnet-related packages have been removed for being unmaintaned. Please use `fetchNuGet` for specific packages.
  - Autofac
  - SystemValueTuple
  - MicrosoftDiaSymReader
  - MicrosoftDiaSymReaderPortablePdb
  - SystemCollectionsImmutable
  - SystemCollectionsImmutable131
  - SystemReflectionMetadata
  - NUnit350
  - Deedle
  - ExcelDna
  - GitVersionTree
  - NDeskOptions

* The `antlr` package now defaults to the 4.x release instead of the
  old 2.7.7 version.

* The `pulseeffects` package updated to [version 4.x](https://github.com/wwmm/easyeffects/releases/tag/v6.0.0) and renamed to `easyeffects`.