Warning apt update Subscription Manager on Ubuntu 24

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You have two options:

  1. Ignore those “Notification” level warnings.
  2. Set up APT repo signing on your Katello instance.

Unfortunately 2. is pretty involved and not well documented.

There is a really old thread describing APT repo signing setup here: Pulp_deb for pulp3 in Katello - #13 by quba42

There is also the pulp_deb component specific documentation here: Signing Service Creation - Pulp Project

This latter documentation is more up to date, but not Katello specific. For Katello to pick up on the signing service you create, it must be named katello_deb_sign.

I will also bring up internally if we can find some time to document this process properly.