systemctl，图形登录没出现，为什么？
Ubuntu 16.04。 我启动了我的系统，但我登陆了控制台登录。 为什么不启动我的图形登录？ 我该如何解决这个问题？ 我该怎么调试呢？
来自journalctl -xb一些消息：
Jul 30 17:44:58 gcomputer dbus[2494]: [system] Failed to activate service 'org.freesmartphone.ogsmd': timed out Jul 30 17:44:58 gcomputer dbus[2494]: [system] Activating service name='org.freesmartphone.ogsmd' (using servicehelper) Jul 30 17:44:58 gcomputer org.freesmartphone.ogsmd[2494]: 2016-07-30T15:44:58.105551Z [WARN] subsystem : Could not load plugin: Could not load /us Jul 30 17:45:07 gcomputer kdm[2881]: X server termination timeout, killing Jul 30 17:45:07 gcomputer kdm[2881]: X server for display :0 cannot be started, session disabled Jul 30 17:45:23 gcomputer dbus[2494]: [system] Failed to activate service 'org.freesmartphone.ogsmd': timed out Jul 30 17:45:23 gcomputer dbus[2494]: [system] Activating service name='org.freesmartphone.ogsmd' (using servicehelper) Jul 30 17:45:23 gcomputer org.freesmartphone.ogsmd[2494]: 2016-07-30T15:45:23.129582Z [WARN] subsystem : Could not load plugin: Could not load /us Jul 30 17:45:48 gcomputer dbus[2494]: [system] Failed to activate service 'org.freesmartphone.ogsmd': timed out Jul 30 17:45:48 gcomputer dbus[2494]: [system] Activating service name='org.freesmartphone.ogsmd' (using servicehelper) Jul 30 17:45:48 gcomputer org.freesmartphone.ogsmd[2494]: 2016-07-30T15:45:48.156545Z [WARN] subsystem : Could not load plugin: Could not load /us Jul 30 17:46:13 gcomputer dbus[2494]: [system] Failed to activate service 'org.freesmartphone.ogsmd': timed out Jul 30 17:46:14 gcomputer dbus[2494]: [system] Rejected send message, 1 matched rules; type="method_call", sender=":1.20" (uid=0 pid=2803 comm="/us Jul 30 17:47:13 gcomputer systemd[1]: Reloading. ... Jul 30 17:48:19 gcomputer console-kit-daemon[4607]: (process:4671): GLib-CRITICAL **: g_slice_set_config: assertion 'sys_page_size == 0' failed Jul 30 17:48:19 gcomputer console-kit-daemon[4607]: missing action Jul 30 17:48:19 gcomputer dbus[2494]: [system] Successfully activated service 'org.freedesktop.ConsoleKit' Jul 30 17:48:19 gcomputer systemd[1]: Started Console Manager.
也许还有关系：
root@gcomputer:~# systemctl get-default graphical.target root@gcomputer:~# systemctl status kdm ● kdm.service - LSB: X display manager for KDE Loaded: loaded (/etc/init.d/kdm; bad; vendor preset: enabled) Active: active (running) since Sun 2016-07-31 01:41:27 CEST; 7h left Docs: man:systemd-sysv-generator(8) CGroup: /system.slice/kdm.service └─2881 /usr/bin/kdm Jul 31 01:41:27 gcomputer systemd[1]: Starting LSB: X display manager for KDE... Jul 31 01:41:27 gcomputer kdm[2562]: * Starting K Display Manager kdm Jul 31 01:41:27 gcomputer kdm[2562]: ...done. Jul 31 01:41:27 gcomputer systemd[1]: Started LSB: X display manager for KDE. Jul 31 01:41:57 gcomputer kdm[2881]: X server startup timeout, terminating Jul 30 17:45:07 gcomputer kdm[2881]: X server termination timeout, killing Jul 30 17:45:07 gcomputer kdm[2881]: X server for display :0 cannot be started, session disabled root@gcomputer:~# systemctl status lightdm.service ● lightdm.service - Light Display Manager Loaded: loaded (/lib/systemd/system/lightdm.service; static; vendor preset: enabled) Active: inactive (dead) Docs: man:lightdm(1) Jul 30 18:24:22 gcomputer systemd[1]: Stopped Light Display Manager. Jul 30 18:24:22 gcomputer systemd[1]: Starting Light Display Manager... Jul 30 18:24:22 gcomputer systemd[1]: lightdm.service: Control process exited, code=exited status=1 Jul 30 18:24:22 gcomputer systemd[1]: Failed to start Light Display Manager. Jul 30 18:24:22 gcomputer systemd[1]: lightdm.service: Unit entered failed state. Jul 30 18:24:22 gcomputer systemd[1]: lightdm.service: Failed with result 'exit-code'. Jul 30 18:24:22 gcomputer systemd[1]: lightdm.service: Service hold-off time over, scheduling restart. Jul 30 18:24:22 gcomputer systemd[1]: Stopped Light Display Manager. Jul 30 18:24:22 gcomputer systemd[1]: lightdm.service: Start request repeated too quickly. Jul 30 18:24:22 gcomputer systemd[1]: Failed to start Light Display Manager.
/var/log/Xorg.0.log没有一个错误。 不确定在哪里看：
root@gcomputer:~# grep EE /var/log/Xorg.0.log (WW) warning, (EE) error, (NI) not implemented, (??) unknown. root@gcomputer:~# tail -n 10 /var/log/Xorg.0.log i810, i810-dc100, i810e, i815, i830M, 845G, 854, 852GM/855GM, 865G, 915G, E7221 (i915), 915GM, 945G, 945GM, 945GME, Pineview GM, Pineview G, 965G, G35, 965Q, 946GZ, 965GM, 965GME/GLE, G33, Q35, Q33, GM45, 4 Series, G45/G43, Q45/Q43, G41, B43 [ 3.709] (II) intel: Driver for Intel(R) HD Graphics: 2000-6000 [ 3.709] (II) intel: Driver for Intel(R) Iris(TM) Graphics: 5100, 6100 [ 3.709] (II) intel: Driver for Intel(R) Iris(TM) Pro Graphics: 5200, 6200, P6300 [ 3.709] (II) modesetting: Driver for Modesetting Kernel Drivers: kms [ 3.709] (II) FBDEV: driver for framebuffer: fbdev [ 3.709] (II) VESA: driver for VESA chipsets: vesa
我做了这个，这有效：
root@gcomputer:~# apt-get purge lightdm Reading package lists... Done Building dependency tree Reading state information... Done The following package was automatically installed and is no longer required: liblept5 Use 'apt autoremove' to remove it. The following packages will be REMOVED: lightdm* lightdm-kde-greeter* ubuntu-desktop* 0 upgraded, 0 newly installed, 3 to remove and 1 not upgraded. After this operation, 3152 kB disk space will be freed. Do you want to continue? [Y/n] (Reading database ... 499520 files and directories currently installed.) Removing lightdm-kde-greeter (0.3.2.2-1ubuntu1) ... Purging configuration files for lightdm-kde-greeter (0.3.2.2-1ubuntu1) ... Removing ubuntu-desktop (1.361) ... Removing lightdm (1.18.2-0ubuntu1) ... Purging configuration files for lightdm (1.18.2-0ubuntu1) ... insserv: warning: script 'S04powernowd.early' missing LSB tags and overrides insserv: warning: script 'powernowd.early' missing LSB tags and overrides insserv: warning: script 'S04powernowd.early' missing LSB tags and overrides insserv: warning: script 'powernowd.early' missing LSB tags and overrides dpkg: warning: while removing lightdm, directory '/var/lib/lightdm-data' not empty so not removed dpkg: warning: while removing lightdm, directory '/etc/lightdm' not empty so not removed Processing triggers for dbus (1.10.6-1ubuntu3) ... Processing triggers for man-db (2.7.5-1) ... root@gcomputer:~# rm -rf /etc/lightdm root@gcomputer:~# rm -rf /var/lib/lightdm-data root@gcomputer:~# apt-get install ubuntu-desktop Reading package lists... Done Building dependency tree Reading state information... Done The following packages were automatically installed and are no longer required: liblept5 liblightdm-qt-3-0 Use 'apt autoremove' to remove them. The following additional packages will be installed: lightdm Suggested packages: bindfs The following NEW packages will be installed: lightdm ubuntu-desktop 0 upgraded, 2 newly installed, 0 to remove and 1 not upgraded. Need to get 120 kB of archives. After this operation, 726 kB of additional disk space will be used. Do you want to continue? [Y/n] Get:1 http://de.archive.ubuntu.com/ubuntu xenial-updates/main amd64 lightdm amd64 1.18.2-0ubuntu1 [116 kB] Get:2 http://de.archive.ubuntu.com/ubuntu xenial/main amd64 ubuntu-desktop amd64 1.361 [3616 B] Fetched 120 kB in 0s (490 kB/s) Preconfiguring packages ... Selecting previously unselected package lightdm. (Reading database ... 499338 files and directories currently installed.) Preparing to unpack .../lightdm_1.18.2-0ubuntu1_amd64.deb ... Unpacking lightdm (1.18.2-0ubuntu1) ... Selecting previously unselected package ubuntu-desktop. Preparing to unpack .../ubuntu-desktop_1.361_amd64.deb ... Unpacking ubuntu-desktop (1.361) ... Processing triggers for systemd (229-4ubuntu7) ... Processing triggers for ureadahead (0.100.0-19) ... ureadahead will be reprofiled on next reboot Processing triggers for dbus (1.10.6-1ubuntu3) ... Processing triggers for man-db (2.7.5-1) ... Setting up lightdm (1.18.2-0ubuntu1) ... insserv: warning: script 'S04powernowd.early' missing LSB tags and overrides insserv: warning: script 'powernowd.early' missing LSB tags and overrides Setting up ubuntu-desktop (1.361) ... Processing triggers for dbus (1.10.6-1ubuntu3) ... Processing triggers for systemd (229-4ubuntu7) ... Processing triggers for ureadahead (0.100.0-19) ... root@gcomputer:~# systemctl start lightdm