我正在使用 Ubuntu 18.04，它设置为通过 进行远程登录XDMCP/LightDM。身份验证通过 完成LDAP/SSSD。一切正常，用户可以登录 KDE Plasma，但对于某些用户来说，会话会立即结束。
我检查了文件的权限.Xauthority- 顺便说一下，它们是空的，就像.xsession-errors。
无法通过 - 登录的用户LightDM可以通过终端正常登录。/var/log/syslog或/var/log/lightdm均未/var/log/auth.log给我任何提示。 AppArmor 和 SeLinux 已禁用。
从/var/log/auth.log：
Apr 29 14:05:26 desktop-ubuntu systemd[1]: session-c79.scope: Killing process 26623 (lightdm) with signal SIGTERM.
Apr 29 14:05:26 desktop-ubuntu systemd[1]: session-c79.scope: Killing process 26626 (lightdm-greeter) with signal SIGTERM.
Apr 29 14:05:26 desktop-ubuntu systemd[1]: session-c79.scope: Killing process 26627 (lightdm-gtk-gre) with signal SIGTERM.
Apr 29 14:05:26 desktop-ubuntu systemd[1]: Stopping Session c79 of user lightdm.
Apr 29 14:05:26 desktop-ubuntu systemd[1]: Stopped Session c79 of user lightdm.
Apr 29 14:05:26 desktop-ubuntu systemd[1]: Created slice User Slice of XXX.
Apr 29 14:05:26 desktop-ubuntu systemd[1]: Starting User Manager for UID 1406...
Apr 29 14:05:26 desktop-ubuntu systemd[1]: Started Session c80 of user XXX.
Apr 29 14:05:26 desktop-ubuntu systemd[26668]: Listening on GnuPG cryptographic agent and passphrase cache.
Apr 29 14:05:26 desktop-ubuntu systemd[26668]: Listening on GnuPG cryptographic agent and passphrase cache (restricted).
Apr 29 14:05:26 desktop-ubuntu systemd[26668]: Started Pending report trigger for Ubuntu Report.
Apr 29 14:05:26 desktop-ubuntu systemd[26668]: Listening on GnuPG cryptographic agent (ssh-agent emulation).
Apr 29 14:05:26 desktop-ubuntu systemd[26668]: Listening on GnuPG network certificate management daemon.
Apr 29 14:05:26 desktop-ubuntu systemd[26668]: Reached target Timers.
Apr 29 14:05:26 desktop-ubuntu systemd[26668]: Reached target Paths.
Apr 29 14:05:26 desktop-ubuntu systemd[26668]: Listening on GnuPG cryptographic agent and passphrase cache (access for web browsers).
Apr 29 14:05:26 desktop-ubuntu systemd[26668]: Starting D-Bus User Message Bus Socket.
Apr 29 14:05:26 desktop-ubuntu systemd[26668]: Listening on D-Bus User Message Bus Socket.
Apr 29 14:05:26 desktop-ubuntu systemd[26668]: Reached target Sockets.
Apr 29 14:05:26 desktop-ubuntu systemd[26668]: Reached target Basic System.
Apr 29 14:05:26 desktop-ubuntu systemd[26668]: Reached target Default.
Apr 29 14:05:26 desktop-ubuntu systemd[26668]: Startup finished in 40ms.
Apr 29 14:05:26 desktop-ubuntu systemd[1]: Started User Manager for UID 1406.
Apr 29 14:05:26 desktop-ubuntu lightdm[25089]: Error activating login1 session: GDBus.Error:org.freedesktop.DBus.Error.NotSupported: Operation not supported
Apr 29 14:05:26 desktop-ubuntu systemd[26668]: Started D-Bus User Message Bus.
Apr 29 14:05:26 desktop-ubuntu dbus-daemon[26706]: [session uid=1406 pid=26706] AppArmor D-Bus mediation is enabled