The oVirt Team has just released a new version of ovirt-engine package that fixes upgrade related issues.[1][2]. We recommend to users experiencing upgrade issues to try again with this new release.Thanks, [1] Bug 1609839 - Foreign key constraint violation on upgrade to 4.2.5 [2] Bug 1613168 - On rollback of failed upgrade from 4.2.1+, engine-setup outputs errors about the uuid-ossp extension -- SANDRO BONAZZOLA MANAGER, SOFTWARE ENGINEERING, EMEA R&D RHV Red Hat EMEA <https://www.redhat.com/> sbonazzo@redhat.com <https://red.ht/sig> <https://www.redhat.com/en/events/red-hat-open-source-day-italia?sc_cid=701f2000000RgRyAAK>