I found the root cause, but unable to fix it.
in window the network packet
Rsrv0103QAP1\r\n\r\nARpt----------\r\n ARpt mean plain text authentication
in Ubuntu the network packet
Rsrv0103QAP1\r\n\r\nARucKIl ARpt--\r\n ARuc mean crypt authentication, but follow ARpt
even my configure file /etc/Rserv,conf already set
Rserve still return both ARuc and ARpt
Good news. This is now fixed as of 8.1.4.