麒麟服务器【不能输入密码提示Login incorrect】

【现象】

1. 登录界面无法输入账号密码，只有一个“重试”按钮可以点，如下图所示：
   
2. 终端界面输入用户名后，无法输入密码，直接报了“Login incorrect”，如下图所示：
   

【排查】

查看/etc/pam.d/目录下的lightdm和login文件，发现这两个文件已经被清空。

【处理】

添加上相关内容后，重启后，系统正常进入。

1. cat /etc/pam.d/lightdm

   #%PAM-1.0
   auth     [success=done ignore=ignore default=bad] pam_selinux_permit.so
   auth       required    pam_env.so
   auth       substack    system-auth
   -auth       optional    pam_gnome_keyring.so
   -auth       optional    pam_kwallet5.so
   -auth       optional    pam_kwallet.so
   auth       include     postlogin
   account    required    pam_nologin.so
   account    include     system-auth
   password   include     system-auth
   session    required    pam_selinux.so close
   session    required    pam_loginuid.so
   session    optional    pam_console.so
   -session    optional    pam_ck_connector.so
   session    required    pam_selinux.so open
   session    optional    pam_keyinit.so force revoke
   session    required    pam_namespace.so
   session    include     system-auth
   -session    optional    pam_gnome_keyring.so auto_start
   -session    optional    pam_kwallet5.so
   -session    optional    pam_kwallet.so
   session    optional    pam_lastlog.so silent
   session    include     postlogin

2. cat /etc/pam.d/login

   #%PAM-1.0
   auth       substack     system-auth
   auth       include      postlogin
   account    required     pam_nologin.so
   account    include      system-auth
   password   include      system-auth
   # pam_selinux.so close should be the first session rule
   session    required     pam_selinux.so close
   session    required     pam_loginuid.so
   # pam_selinux.so open should only be followed by sessions to be executed in the user context
   session    required     pam_selinux.so open
   session    required     pam_namespace.so
   session    optional     pam_keyinit.so force revoke
   session    include      system-auth
   session    include      postlogin
   -session   optional     pam_ck_connector.so

如果还有其他类似问题，可以检查一下相同目录下的其他文件，例如sshd、ukui-screensaver-qt等。