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1. Reinstall one of the postgres-slaves with 18.04 with role::base
2. In the node-file of this postgres-slave, set the following keys:
   1. profile::postgres::keepalived::enable: false
   2. profile::postgres::version: '13'
   3. profile::postgres::masterserver: '<fqdn-of-the-new-postgres-master>'
3. Install role::postgres::master on the postgres-machine
4. Take a backup from the old postgres-master machine using the command sudo -u postgres pg_dumpall > postgresdb.pgsql
5. Move this backup to the new postgres-master, and restore it to the server using the command sudo -u postgres psql -f /tmp/postgresdb.pgsql
6. Stop puppet on the old postgres master before next step. Just to be sure it does not use the new postgres master's IP for keepalived.
7. Change the global hiera-key profile::postgres::ipv4 to point to the IP of the new postgres master, and run puppet on the puppetdb servers.
8. Install Ubuntu 18.04 with the role role::postgres::slave on the rest of the postgres-machines. While this installation is going, move the hiera-keys in step 2 from the node-file to a global file (key c already exist, so make sure that there is no duplicate).
9. Use postgres-joinMaster.sh on the slaves to have them replicating their master.

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