hook failed: "certificates-relation-joined" when private ppa is not configured about kafka-charm

[davecore82]

My workaround is to attach an Ubuntu Advantage UA Apps subscription and juju resolve the unit, I'm on Ubuntu 18.04:

ubuntu@kubeflow-demo:~$ juju ssh kafka/0

ubuntu@node08ob32:~$ sudo add-apt-repository ppa:canonical-server/ua-client-daily
ubuntu@node08ob32:~$ sudo apt install ubuntu-advantage-tools
ubuntu@node08ob32:~$ sudo ua attach <my token from https://ubuntu.com/advantage>
ubuntu@node08ob32:~$ apt-cache policy kafka
kafka:
  Installed: (none)
  Candidate: 2.2.2u1-0ubuntu1+esm2
  Version table:
     2.2.2u1-0ubuntu1+esm2 500
        500 https://esm.ubuntu.com/apps/ubuntu bionic-apps-security/main amd64 Packages
ubuntu@node08ob32:~$ logout

ubuntu@kubeflow-demo:~$ juju resolve kafka/0
ubuntu@kubeflow-demo:~/kubeflow-demo/infrastructure/kubeflow$ juju status kafka
Model  Controller             Cloud/Region       Version  SLA          Timestamp
kafka  maas_cloud_controller  orangebox/default  2.7.8    unsupported  13:45:53Z

App    Version  Status  Scale  Charm  Store       Rev  OS      Notes
kafka  2.2.2u1  active      1  kafka  jujucharms   30  ubuntu  
ntp    3.2      active      1  ntp    jujucharms   45  ubuntu  

Unit      Workload  Agent  Machine  Public address  Ports     Message
kafka/0*  active    idle   0        172.27.33.55    9093/tcp  ready
  ntp/1   active    idle            172.27.33.55    123/udp   chrony: Ready

Machine  State    DNS           Inst id     Series  AZ       Message
0        started  172.27.33.55  node08ob32  bionic  default  Deployed