Upgrading Lix - Lix Reference Manual

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# Upgrading Lix

FIXME(Lix): does Lix forward to the installer for `nix upgrade-nix`? Should it, if present? Lix should restart the daemon for you but currently doesn't (issue).

For instructions to switch to Lix, see https://lix.systems/install.

Lix may be upgraded by running `nix upgrade-nix` and then restarting the Nix daemon.

## Restarting daemon on Linux

`sudo systemctl daemon-reload && sudo systemctl restart nix-daemon`

## Restarting daemon on macOS

FIXME(Lix): Write instructions that, according to the beta installation guide do not sometimes crash macOS (?!)