I'm following the instructions in the documentation:
https://guix.gnu.org/manual/devel/en/guix.html#index-nix_002dservice_002dtype

$ nix-channel --list
nixpkgs https://channels.nixos.org/nixpkgs-unstable

$ nix-channel --update
# Crashes

/var/log/messages says:
2025-12-05 10:43:31 localhost shepherd[1]: nix-daemon[19743] accepted 
connection from pid 29987, user n655514
2025-12-05 10:43:32 localhost shepherd[1]: nix-daemon[19743] accepted 
connection from pid 30024, user n655514
...
2025-12-05 10:43:32 localhost shepherd[1]: nix-daemon[19743] unexpected Nix 
daemon error: ^[[31;1merror:^[[0m writing to file: ^[[35;1mBroken pipe^[[0m
2025-12-05 10:43:32 localhost gdm: Gdm: on_display_removed: assertion 
'GDM_IS_REMOTE_DISPLAY (display)' failed
2025-12-05 10:43:33 localhost elogind[1527]: Removed session c13.

Any idea what might be wrong?

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