doc: add admonitions for macOS 15 Sequoia update (#11487) (#11509)

The impending release of macOS 15 Sequoia will break many existing nix installs on macOS, which may lead to an increased number of people who are looking to try to reinstall Nix without noticing the open/pinned issue (#10892) that explains the problem and outlines how to migrate existing installs. These admonitions are a short-term measure until we are over the hump and support volumes dwindle. (cherry picked from commit 48477d4) Co-authored-by: Travis A. Everett <[email protected]>
NixOS · Sep 16, 2024 · 1b076b4 · 1b076b4
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diff --git a/doc/manual/src/installation/index.md b/doc/manual/src/installation/index.md
@@ -14,6 +14,14 @@ This option requires either:
 * Linux running systemd, with SELinux disabled
 * MacOS
 
+> **Updating to macOS 15 Sequoia**
+>
+> If you recently updated to macOS 15 Sequoia and are getting
+> ```console
+> error: the user '_nixbld1' in the group 'nixbld' does not exist
+> ```
+> when running Nix commands, refer to GitHub issue [NixOS/nix#10892](https://github.com/NixOS/nix/issues/10892) for instructions to fix your installation without reinstalling.
+
 ```console
 $ bash <(curl -L https://nixos.org/nix/install) --daemon
 ```

diff --git a/doc/manual/src/installation/installing-binary.md b/doc/manual/src/installation/installing-binary.md
@@ -1,5 +1,13 @@
 # Installing a Binary Distribution
 
+> **Updating to macOS 15 Sequoia**
+>
+> If you recently updated to macOS 15 Sequoia and are getting
+> ```console
+> error: the user '_nixbld1' in the group 'nixbld' does not exist
+> ```
+> when running Nix commands, refer to GitHub issue [NixOS/nix#10892](https://github.com/NixOS/nix/issues/10892) for instructions to fix your installation without reinstalling.
+
 To install the latest version Nix, run the following command:
 
 ```console

diff --git a/doc/manual/src/installation/uninstall.md b/doc/manual/src/installation/uninstall.md
@@ -43,6 +43,14 @@ which you may remove.
 
 ### macOS
 
+> **Updating to macOS 15 Sequoia**
+>
+> If you recently updated to macOS 15 Sequoia and are getting
+> ```console
+> error: the user '_nixbld1' in the group 'nixbld' does not exist
+> ```
+> when running Nix commands, refer to GitHub issue [NixOS/nix#10892](https://github.com/NixOS/nix/issues/10892) for instructions to fix your installation without reinstalling.
+
 1. If system-wide shell initialisation files haven't been altered since installing Nix, use the backups made by the installer:
 
    ```console