我们有一些使用 lightdm 和自动登录的信息亭。自动登录有时不起作用，这种情况在重新启动后随机发生，大多数情况下可以工作，但有时会失败。出现的不是自动登录，而是登录屏幕。用户需要输入登录名和密码，这在信息亭上是不好的。
当它失败时我可以看到journalctl -u lightdm：
úno 01 04:00:39 rockpi-4b systemd[1]: Starting Light Display Manager...
úno 01 04:00:39 rockpi-4b lightdm[580]: Error getting user list from org.freedesktop.Accounts: GDBus.Error:org.freedesktop.DBus.Error.ServiceUnknown: The name org.freedesktop.Accounts was not provided by any .service files
úno 01 04:00:39 rockpi-4b systemd[1]: Started Light Display Manager.
úno 01 04:00:41 rockpi-4b lightdm[785]: Error getting user list from org.freedesktop.Accounts: GDBus.Error:org.freedesktop.DBus.Error.ServiceUnknown: The name org.freedesktop.Accounts was not provided by any .service files
úno 01 04:00:41 rockpi-4b lightdm[785]: pam_unix(lightdm-greeter:session): session opened for user lightdm by (uid=0)
úno 01 09:01:22 rockpi-4b lightdm[2689]: pam_unix(lightdm:auth): check pass; user unknown
úno 01 09:01:22 rockpi-4b lightdm[2689]: pam_unix(lightdm:auth): authentication failure; logname= uid=0 euid=0 tty=:0 ruser= rhost=
当我重新启动 lightdm 时，systemctl restart lightdm它开始工作（自动登录成功）：
úno 01 09:52:16 rockpi-4b systemd[1]: Starting Light Display Manager...
úno 01 09:52:16 rockpi-4b lightdm[3180]: Error getting user list from org.freedesktop.Accounts: GDBus.Error:org.freedesktop.DBus.Error.ServiceUnknown: The name org.freedesktop.Accounts was not provided by any .service files
úno 01 09:52:16 rockpi-4b systemd[1]: Started Light Display Manager.
úno 01 09:52:17 rockpi-4b lightdm[3205]: Error getting user list from org.freedesktop.Accounts: GDBus.Error:org.freedesktop.DBus.Error.ServiceUnknown: The name org.freedesktop.Accounts was not provided by any .service files
úno 01 09:52:17 rockpi-4b lightdm[3205]: pam_unix(lightdm-autologin:session): session opened for user pi by (uid=0)
那是什么意思pam_unix错误？
pam_unix(lightdm:auth): authentication failure; logname= uid=0 euid=0 tty=:0 ruser= rhost=
我在 rockpi-4b（内核 5.10.103+）上使用 debian buster aarch64
我该如何修复该错误，是错误还是之间的某些配置错误帕姆和光DM？