F27: how to disable packagekit to download updates

[Dario Lesca]

How to I can disable packagekid to download update?

I do not use these packages downloaded uselessly from packagekit into
/var/cache/PackageKit/*/*/updates/... because I run sometimes when I
want and can, after, reboot, "sudo dnf update".

Unfortunately this command (dnf) do not use the rpm files download from
PackageKit but it downloads them again ... Sigh!

Many thanks