PRVF-7566 or PRVF-07566
Saw an error PRVF-7566 when Oracle Universal Installer (OUI) 19c perform a prerequisite check.
PRVF-7566 : User "oracle" does not belong to group "oper" on node "test"
PRVF-7566 means that one of the groups you defined in the previous installation step does not include the software owner as a member.
In reality, the roles in a DBA team may not be finely divided to meet group requirements, so we usually create only 2 groups, dba and oper to define OSDBA and OSOPER respectively in order to simplify our situations.
In this case, we forgot to add user oracle to the group oper which is defined as OSOPER. So the solution is obvious, we have to add the user to the group by command usermod.