This error is the result of a previous update failure. This could have been because the server didn't have enough diskspace or some other failure that caused the database to be partially updated. During the upgrade/update process the postgres database is modified to include new tables. Also existing tables in the database are modified. For this specific error, the update process is attempting to add a record to table public.role. As the error message indicates, it is attempting to add a record named SERVICE ACCOUNTS but the postgres database says that the record already exists.
To eliminate the condition the table needs to be modified to remove the conflicting record.