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You can monitor updates availability automatically by email after modifying the dnf-automatic configuration file (usually `/etc/dnf/automatic.conf`).
You can still use `download_updates` and `apply_updates` settings from inside `/etc/dnf/automatic.conf`.
You do not have any irreplaceable data on the machine, or have proper backups of such data.
You installed a custom kernel, custom kernel modules, third party kernel modules, or have a third party application that depends on kernel versions (this may not be a problem if you exclude kernel updates, which is the default in Fedora `dnf.conf` files). (See also https://bugzilla.redhat.com/show_bug.cgi?id=870790[bug #870790] - you may need to modify the base section to add `exclude=kernel*`.)
You installed custom software, compiled software from source, or use third party software that has strict package version requirements.
You must decide whether to use automatic xref:dnf.adoc[DNF] updates on each of your machines. There are a number of arguments both for and against automatic updates to consider. However, there is no single answer to this question: it is up to the system administrator or owner of each machine to decide whether automatic updates are desirable or not for that machine. One of the things which makes one a good system administrator is the ability to evaluate the facts and other people's suggestions, and then decide for oneself what one should do.
Your environment requires meticulous change-control procedures.
You should then edit the configuration. Descriptions of the options are contained in the conf file `/etc/auter/auter.conf`.
You update from other third party DNF repositories besides Fedora (core, extras, legacy), repositories which may conflict in versioning schemes for the same packages.
You would replace root with an actual email address to which you want the report sent, and localhost with an actual address of a SMTP server. This change will mean that after dnf-automatic runs, it will email you information about available updates, a log about downloaded packages, or installed updates according to settings in `automatic.conf`.