Subject RE: Duplicate values in system index
Author Leyne, Sean

> gbak: restoring privilege for user SYSDBA
> gbak: restoring SQL role: RDB$ADMIN
> gbak: ERROR: attempt to store duplicate value (visible to active
> transactions) in unique index "RDB$INDEX_39"
> RDB$INDEX_39 relation name is RDB$ROLES.
> RDB$ROLES has one row, RDB$ADMIN.

Are you trying to restore a backup from a higher FB version with a lower gbak version?