我在 Ubuntu 14.04.03 32 位平台上。前一天从源代码安装 udev 时，它弄乱了我的系统中的权限。我修复了一些权限，然后设法登录。我注意到登录屏幕中未设置用户壁纸。我重新安装了 lightdm 和 lightdm-gtk-greeter，但它不起作用。如果/etc/lightdm/lightdm-gtk-greeter.conf我background=手动设置路径，它会显示壁纸，但当我更改用户壁纸时，它不会在登录屏幕上同步壁纸。
我测试了 lightdmlightdm --test-mode --debug
[+0.00s] DEBUG: Logging to /home/kenn/.cache/lightdm/log/lightdm.log
[+0.00s] DEBUG: Starting Light Display Manager 1.10.5, UID=1000 PID=4414
[+0.00s] DEBUG: Loading configuration dirs from /usr/share/lightdm/lightdm.conf.d
[+0.00s] DEBUG: Loading configuration from /usr/share/lightdm/lightdm.conf.d/40-lightdm-webkit-greeter.conf
[+0.00s] DEBUG: Loading configuration from /usr/share/lightdm/lightdm.conf.d/50-greeter-wrapper.conf
[+0.00s] DEBUG: Loading configuration from /usr/share/lightdm/lightdm.conf.d/50-guest-wrapper.conf
[+0.00s] DEBUG: Loading configuration from /usr/share/lightdm/lightdm.conf.d/50-ubuntu.conf
[+0.00s] DEBUG: Loading configuration from /usr/share/lightdm/lightdm.conf.d/50-unity-greeter.conf
[+0.00s] DEBUG: Loading configuration from /usr/share/lightdm/lightdm.conf.d/50-xserver-command.conf
[+0.00s] DEBUG: Loading configuration from /usr/share/lightdm/lightdm.conf.d/60-gnome.conf
[+0.00s] DEBUG: Loading configuration from /usr/share/lightdm/lightdm.conf.d/60-lightdm-gtk-greeter.conf
[+0.00s] DEBUG: Loading configuration dirs from /usr/local/share/lightdm/lightdm.conf.d
[+0.00s] DEBUG: Loading configuration dirs from /usr/share/gnome/lightdm/lightdm.conf.d
[+0.00s] DEBUG: Loading configuration dirs from /usr/share/gnome-cairo-dock/lightdm/lightdm.conf.d
[+0.00s] DEBUG: Loading configuration dirs from /etc/xdg/lightdm/lightdm.conf.d
[+0.00s] DEBUG: Loading configuration dirs from /etc/xdg/xdg-gnome-cairo-dock/lightdm/lightdm.conf.d
[+0.00s] DEBUG: Loading configuration from /etc/lightdm/lightdm.conf
[+0.00s] DEBUG: Using D-Bus name org.freedesktop.DisplayManager
[+0.00s] DEBUG: Running in user mode
[+0.00s] DEBUG: Using Xephyr for X servers
[+0.00s] DEBUG: Registered seat module xlocal
[+0.00s] DEBUG: Registered seat module xremote
[+0.00s] DEBUG: Registered seat module unity
[+0.00s] DEBUG: Registered seat module surfaceflinger
[+0.04s] WARNING: Failed to get list of logind seats: GDBus.Error:org.freedesktop.DBus.Error.ServiceUnknown: The name org.freedesktop.login1 was not provided by any .service files
[+0.04s] DEBUG: Adding default seat
[+0.04s] DEBUG: Seat: Starting
[+0.04s] DEBUG: Seat: Creating greeter session
[+0.04s] DEBUG: Loading users from org.freedesktop.Accounts
[+0.04s] DEBUG: User /org/freedesktop/Accounts/User1002 added
[+0.05s] DEBUG: User /org/freedesktop/Accounts/User1004 added
[+0.06s] DEBUG: User /org/freedesktop/Accounts/User1000 added
[+0.10s] DEBUG: User /org/freedesktop/Accounts/User1003 added
[+0.10s] DEBUG: User /org/freedesktop/Accounts/User1001 added
[+0.11s] DEBUG: Seat: Creating display server of type x
[+0.11s] DEBUG: Seat: Starting local X display
[+0.11s] DEBUG: DisplayServer x-1: Logging to /home/kenn/.cache/lightdm/log/x-1.log
[+0.11s] DEBUG: DisplayServer x-1: Writing X server authority to /home/kenn/.cache/lightdm/run/root/:1
[+0.15s] DEBUG: DisplayServer x-1: Launching X Server
[+0.15s] DEBUG: Launching process 4418: /usr/bin/Xephyr :1 -seat seat0 -auth /home/kenn/.cache/lightdm/run/root/:1 -nolisten tcp
[+0.15s] DEBUG: DisplayServer x-1: Waiting for ready signal from X server :1
[+0.16s] DEBUG: Acquired bus name org.freedesktop.DisplayManager
[+0.16s] DEBUG: Registering seat with bus path /org/freedesktop/DisplayManager/Seat0
[+0.56s] DEBUG: Got signal 10 from process 4418
[+0.56s] DEBUG: DisplayServer x-1: Got signal from X server :1
[+0.56s] DEBUG: DisplayServer x-1: Connecting to XServer :1
[+0.57s] DEBUG: Launching process 4424: play-sound /home/kenn/Documents/The_Best_windows_startup_sound_Ever___.mp3
[+0.59s] DEBUG: Process 4424 exited with return value 0
[+0.59s] DEBUG: Seat: Exit status of play-sound /home/kenn/Documents/The_Best_windows_startup_sound_Ever___.mp3: 0
[+0.60s] DEBUG: Seat: Display server ready, starting session authentication
[+0.60s] DEBUG: Session: Not setting XDG_VTNR
[+0.60s] DEBUG: Session pid=4426: Started with service 'lightdm-greeter', username 'kenn'
Home directory not accessible: Permission denied
W: [pulseaudio] core-util.c: Failed to open configuration file '//.config/pulse//daemon.conf': Permission denied
W: [pulseaudio] daemon-conf.c: Failed to open configuration file: Permission denied
[+0.79s] DEBUG: Session pid=4426: Authentication complete with return value 0: Success
[+0.79s] DEBUG: Seat: Session authenticated, running command
[+0.79s] DEBUG: Session pid=4426: Not setting XDG_VTNR
[+0.79s] DEBUG: Session pid=4426: Running command /usr/lib/lightdm/lightdm-greeter-session /usr/sbin/lightdm-gtk-greeter
[+0.79s] DEBUG: Creating shared data directory /var/lib/lightdm-data/kenn
[+0.79s] DEBUG: Session pid=4426: Logging to /home/kenn/.cache/lightdm/log/x-1-greeter.log
[+1.16s] DEBUG: Session pid=4426: Greeter connected version=1.10.5
[+2.10s] DEBUG: Session pid=4426: Greeter start authentication for kenn
[+2.10s] DEBUG: Session: Not setting XDG_VTNR
[+2.10s] DEBUG: Session pid=4470: Started with service 'lightdm', username 'kenn'
[+2.29s] DEBUG: Session pid=4470: Authentication complete with return value 0: Success
[+2.29s] DEBUG: Session pid=4426: Authenticate result for user kenn: Success
[+2.29s] DEBUG: Session pid=4426: User kenn authorized
我还注意到 lightdm 上的电源选项shutdown, reboot, hibernate..未处于活动状态，我该如何修复它？