Upgrade from 5.1 to 5.5 and PostgreSQL

I tried to upgrade my working 5.1.0 install to 5.5.0 via zypper upgrade.

All went well until restart. When machine starts I see PostgreSQL service start, but Rockstor GUI will not come up. From system log I see that rockstor-pre.service fails to start.

Decisive line appears to be:

suse pam_unix(su-l:session): session closed for user postgres

During upgrade postgresql and postgresql-server and postgresql-server-devel were upgraded to ver. 17 from 13.

I tried to follow/learn from that topic here:

But manual database conversion does not work correctly. If I mv old data13 directory → data, it says that it is already ver. 17 and service can not start.