为提高效率，提问时请提供以下信息，问题描述清晰可优先响应。
【DM版本】:8，7
【操作系统】：银河麒麟4.0.2
【CPU】:rk3399k
【问题描述】*：安装完成后，使用root账户执行root_installer.sh失败
使用journalctl -xe 查看问题

1月 18 13:30:49 kylinOS systemd[1]: DmAPService.service: Unit entered failed stat
1月 18 13:30:49 kylinOS systemd[1]: DmAPService.service: Failed with result 'time
1月 18 13:30:51 kylinOS sendmail[9578]: My unqualified host name (kylinOS) unknow
1月 18 13:30:57 kylinOS sendmail[9582]: My unqualified host name (kylinOS) unknow
1月 18 13:31:15 kylinOS sendmail[9588]: My unqualified host name (kylinOS) unknow
lines 2211-2233/2233 (END)

– 启动结果为“done”。
1月 18 13:30:41 kylinOS systemd[1]: Starting Dameng Assistant Plug-In Service(DmAPService)…
– Subject: DmAPService.service 单元已开始启动
– Defined-By: systemd
– Support: http://lists. freedesktop.org/mailman/listinfo/systemd-devel

– DmAPService.service 单元已开始启动。
1月 18 13:30:49 kylinOS systemd[1]: DmAPService.service: Start operation timed out. Terminating.
1月 18 13:30:49 kylinOS DmAPService[9704]: Starting DmAPService:
1月 18 13:30:49 kylinOS systemd[1]: Failed to start Dameng Assistant Plug-In Service(DmAPService)…
– Subject: DmAPService.service 单元已失败
– Defined-By: systemd
– Support: http://lists. freedesktop.org/mailman/listinfo/systemd-devel

– DmAPService.service 单元已失败。

– 结果为“failed”。
1月 18 13:30:49 kylinOS systemd[1]: DmAPService.service: Unit entered failed state.
1月 18 13:30:49 kylinOS systemd[1]: DmAPService.service: Failed with result ‘timeout’.
1月 18 13:30:51 kylinOS sendmail[9578]: My unqualified host name (kylinOS) unknown; sleeping for retry
1月 18 13:30:57 kylinOS sendmail[9582]: My unqualified host name (kylinOS) unknown; sleeping for retry
1月 18 13:31:15 kylinOS sendmail[9588]: My unqualified host name (kylinOS) unknown; sleeping for retry