[ovirt-users] Update to 4.2.0 failing in db check

Hello list, I was about to upgrade from 4.1.8.2-1.el7.centos to 4.2.0 but engine-setup fails. Here's the relevant output: [ ERROR ] Failed to execute stage 'Setup validation': Failed checking Engine database: an exception occurred while validating the Engine database, please check the logs for getting more info: Constraint violation found in vm_interface (vmt_guid) |1 [ INFO ] Stage: Clean up Log file is located at /var/log/ovirt-engine/setup/ovirt-engine-setup-20171220110337-cy5ri9.log [ INFO ] Generating answer file '/var/lib/ovirt-engine/setup/answers/20171220110551-setup.conf' [ INFO ] Stage: Pre-termination [ INFO ] Stage: Termination [ ERROR ] Execution of setup failed any ideas?? -- gb PGP Key: http://pgp.mit.edu/ Primary key fingerprint: C510 0765 943E EBED A4F2 69D3 16CC DC90 B9CB 0F34