The customer faced an error as below:

~~~

2025-05-11 09:48:35.614441 | 525400a8-4987-dc9d-246c-00000000038b | FATAL | install leapp | undercloud-16-2 | error={"changed": false, "failures": [], "msg": "Depsolve Error occured: \n Problem: cannot install the best candidate for the job\n - nothing provides (leapp-repository-openstack-config or leapp-upgrade-el8toel9 >= 0.18.0) needed by leapp-repository-openstack-0.0.13-3.el8ost.noarch", "rc": 1, "results": []}

~~~

They are using the command:

$ openstack undercloud upgrade --yes --system-upgrade /home/stack/templates/system_upgrade.yaml

It seems that a bug with latest leapp-upgrade-el8toel9 package.
It should be include the leapp-upgrade-el8toel9 package from rhel-8-for-x86_64-appstream-tus-rpms.

latest package:
https://access.redhat.com/downloads/content/leapp-upgrade-el8toel9/0.20.0-2.el8/noarch/fd431d51/package

old package:
https://access.redhat.com/downloads/content/leapp-upgrade-el8toel9/0.18.0-1.el8/noarch/fd431d51/package

The latest leapp-upgrade-el8toel9 package is missing from the rhel-8-for-x86_64-appstream-tus-rpms repository.

A possible workaround is modifying THT.
Note: modifying THT is not allowed usually. But only this time we need to allow it.

~~~
$ sudo cp /usr/share/openstack-tripleo-heat-templates/deployment/tripleo-packages/tripleo-packages-baremetal-puppet.yaml /home/stack/tripleo-packages-baremetal-puppet.yaml.backup
$ sudo vim /usr/share/openstack-tripleo-heat-templates/deployment/tripleo-packages/tripleo-packages-baremetal-puppet.yaml

  (Original setting)
              - name: install leapp
                package:
                  name: leapp-repository-openstack
                  state: latest

  (Modify it to this example)
              - name: install leapp
                package:
                  name: leapp-repository-openstack-0.0.13-1.el8ost
                  # state: latest
~~~

After completing the upgrade, please revert modification

~~~

1. diff /usr/share/openstack-tripleo-heat-templates/deployment/tripleo-packages/tripleo-packages-baremetal-puppet.yaml /home/stack/tripleo-packages-baremetal-puppet.yaml.backup

   ==> Ensure that the difference between the two files is the modification that we made manually on the above instruction

1. sudo cp /home/stack/tripleo-packages-baremetal-puppet.yaml.backup /usr/share/openstack-tripleo-heat-templates/deployment/tripleo-packages/tripleo-packages-baremetal-puppet.yaml

   ===> revert the modification

~~~