15.10 lightdm破碎 – gdm有效
在对我的系统进行一些更新后， lightdm似乎被破坏了（无法使用lightdm进行会话工作，在启动时总是以低图形模式结束）。 如果我选择gdm它会起作用。 但是我想回lightdm-gtk-greeter因为我真的不喜欢lightdm-gtk-greeter 。
lightdm --test-mode --debug给出
[+0.00s] DEBUG: Logging to /home/andreas/.cache/lightdm/log/lightdm.log [+0.00s] DEBUG: Starting Light Display Manager 1.16.6, UID=1000 PID=11764 [+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/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 from /usr/share/lightdm/lightdm.conf.d/90-nvidia.conf [+0.00s] DEBUG: [SeatDefaults] is now called [Seat:*], please update this configuration [+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/ubuntu/lightdm/lightdm.conf.d [+0.00s] DEBUG: Loading configuration dirs from /etc/xdg/lightdm/lightdm.conf.d [+0.00s] DEBUG: Loading configuration dirs from /usr/share/upstart/xdg/lightdm/lightdm.conf.d [+0.00s] DEBUG: Loading configuration dirs from /etc/xdg/xdg-ubuntu/lightdm/lightdm.conf.d [+0.00s] DEBUG: Loading configuration from /etc/lightdm/lightdm.conf [+0.00s] DEBUG: [SeatDefaults] is now called [Seat:*], please update this configuration [+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 [+0.02s] DEBUG: Monitoring logind for seats [+0.02s] DEBUG: New seat added from logind: seat0 [+0.02s] DEBUG: Seat seat0: Loading properties from config section Seat:* [+0.02s] DEBUG: Seat seat0: Starting [+0.02s] DEBUG: Seat seat0: Creating greeter session [+0.02s] DEBUG: Loading users from org.freedesktop.Accounts [+0.02s] DEBUG: User /org/freedesktop/Accounts/User1000 added [+0.02s] DEBUG: Seat seat0: Creating display server of type x [+0.03s] DEBUG: Seat seat0: Starting local X display [+0.03s] DEBUG: DisplayServer x-1: Logging to /home/andreas/.cache/lightdm/log/x-1.log [+0.03s] DEBUG: DisplayServer x-1: Writing X server authority to /home/andreas/.cache/lightdm/run/root/:1 [+0.03s] DEBUG: DisplayServer x-1: Launching X Server [+0.03s] DEBUG: Launching process 11769: /usr/bin/Xephyr :1 -seat seat0 -auth /home/andreas/.cache/lightdm/run/root/:1 -nolisten tcp [+0.03s] DEBUG: DisplayServer x-1: Waiting for ready signal from X server :1 [+0.03s] DEBUG: Acquired bus name org.freedesktop.DisplayManager [+0.03s] DEBUG: Registering seat with bus path /org/freedesktop/DisplayManager/Seat0 [+0.04s] DEBUG: Process 11769 exited with return value 1 [+0.04s] DEBUG: DisplayServer x-1: X server stopped [+0.04s] DEBUG: DisplayServer x-1: Removing X server authority /home/andreas/.cache/lightdm/run/root/:1 [+0.04s] DEBUG: Seat seat0: Display server stopped [+0.04s] DEBUG: Launching process 11770: /sbin/prime-switch Warning: writing to /var/log/gpu-manager.log failed (Permission denied) log_file: /var/log/gpu-manager.log last_boot_file: /var/lib/ubuntu-drivers-common/last_gfx_boot new_boot_file: /var/lib/ubuntu-drivers-common/last_gfx_boot /etc/modprobe.d is not a file grep dmesg status 256 dmesg status 256 == 0? No /etc/modprobe.d is not a file /etc/modprobe.d is not a file /etc/modprobe.d is not a file Is nvidia loaded? yes Was nvidia unloaded? no Is nvidia blacklisted? no Is fglrx loaded? no Was fglrx unloaded? no Is fglrx blacklisted? no Is intel loaded? yes Is radeon loaded? no Is radeon blacklisted? no Is nouveau loaded? no Is nouveau blacklisted? yes Is fglrx kernel module available? no Is nvidia kernel module available? yes Vendor/Device Id: 8086:a16 BusID "PCI:0@0:2:0" Is boot vga? yes Vendor/Device Id: 10de:1290 BusID "PCI:9@0:0:0" Is boot vga? no Skipping "/dev/dri/card1", driven by "nvidia-drm" Skipping "/dev/dri/card0", driven by "i915" Skipping "/dev/dri/card1", driven by "nvidia-drm" Skipping "/dev/dri/card0", driven by "i915" Skipping "/dev/dri/card1", driven by "nvidia-drm" Found "/dev/dri/card0", driven by "i915" output 0: eDP connector Number of connected outputs for /dev/dri/card0: 1 Does it require offloading? yes last cards number = 2 Has amd? no Has intel? yes Has nvidia? yes How many cards? 2 Has the system changed? No main_arch_path x86_64-linux-gnu, other_arch_path i386-linux-gnu update-alternatives: error: no alternatives for x86_64-linux-gnu_gfxcore_conf Current alternative: /usr/lib/nvidia-358-prime/ld.so.conf Current core alternative: (null) Is nvidia enabled? no Is fglrx enabled? no Is mesa enabled? no Is pxpress enabled? no Is prime enabled? yes Is nvidia available? yes Is fglrx available? no Is fglrx-core available? no Is mesa available? yes Is pxpress available? no Is prime available? yes Intel IGP detected Intel hybrid system Nvidia driver version 358.16 detected Removing xorg.conf. Path: /etc/X11/xorg.conf Moved /etc/X11/xorg.conf to /etc/X11/xorg.conf.01122016 Powering off the discrete card initctl: Name "com.ubuntu.Upstart" does not exist Unloading nvidia-uvm with "no" parameters rmmod: ERROR: Module nvidia_uvm is not currently loaded Unloading nvidia with "no" parameters rmmod: ERROR: Module nvidia is in use by: nvidia_modeset [+0.08s] DEBUG: Process 11770 exited with return value 0 [+0.08s] DEBUG: Seat seat0: Exit status of /sbin/prime-switch: 0 [+0.08s] DEBUG: Seat seat0: Stopping; greeter display server failed to start [+0.08s] DEBUG: Seat seat0: Stopping [+0.08s] DEBUG: Seat seat0: Stopping session [+0.08s] DEBUG: Seat seat0: Session stopped [+0.08s] DEBUG: Seat seat0: Stopped [+0.08s] DEBUG: Required seat has stopped [+0.08s] DEBUG: Stopping display manager [+0.08s] DEBUG: Display manager stopped [+0.08s] DEBUG: Stopping daemon [+0.08s] DEBUG: Seat seat0: Stopping session [+0.08s] DEBUG: Exiting with return value 1
有人有想法吗？
经过两天的尝试，我自己想出来：
问题是lightdm的.Xauthority文件以某种方式丢失了。 使用touch /var/lib/lightdm/.Xauthority和sudo chown lightdm:lightdm /var/lib/lightdm/.Xauthority创建它sudo chown lightdm:lightdm /var/lib/lightdm/.Xauthority解决了这个问题。
从15.04升级到15.10后，我的桌面被拒绝启动。
在我的情况下，文件夹/var/lib/lightdm根本就不存在，而且正如我所知，它也不是lightdm包的一部分。 创建该文件夹并将所有权转移到lightdm为我解决了这个问题：
mkdir /var/lib/lightdm chown -R lightdm /var/lib/lightdm