我正在运行Debiantesting（Jessie），而XFCE4是我的桌面环境。 我最近做了apt-get升级。 现在，当我启动时，我得到一个闪烁的光标黑屏。 没有任何反应，但我可以去其他terminal（例如ctrl alt + f2）。
lightdm.log：
[+0.02s] DEBUG: Logging to /var/log/lightdm/lightdm.log [+0.02s] DEBUG: Starting Light Display Manager 1.10.3, UID=0 PID=635 [+0.02s] DEBUG: Loading configuration dirs from /usr/share/lightdm/lightdm.conf.d [+0.02s] DEBUG: Loading configuration from /usr/share/lightdm/lightdm.conf.d/01_debian.conf [+0.02s] DEBUG: Loading configuration dirs from /usr/local/share/lightdm/lightdm.conf.d [+0.02s] DEBUG: Loading configuration dirs from /etc/xdg/lightdm/lightdm.conf.d [+0.02s] DEBUG: Loading configuration from /etc/lightdm/lightdm.conf [+0.02s] DEBUG: Using D-Bus name org.freedesktop.DisplayManager [+0.07s] DEBUG: Registered seat module xlocal [+0.07s] DEBUG: Registered seat module xremote [+0.07s] DEBUG: Registered seat module unity [+0.07s] DEBUG: Registered seat module surfaceflinger [+0.38s] WARNING: Failed to get system bus: Could not connect: No such file or directory [+0.38s] DEBUG: Adding default seat [+0.38s] DEBUG: Seat: Starting [+0.38s] DEBUG: Seat: Creating greeter session [+0.47s] DEBUG: Seat: Creating display server of type x [+0.47s] DEBUG: Could not run plymouth --ping: Failed to execute child process "plymouth" (No such file or directory) [+0.47s] DEBUG: Using VT 7 [+0.47s] DEBUG: Seat: Starting local X display on VT 7 [+0.47s] DEBUG: DisplayServer x-0: Logging to /var/log/lightdm/x-0.log [+0.49s] DEBUG: DisplayServer x-0: Writing X server authority to /var/run/lightdm/root/:0 [+0.49s] DEBUG: DisplayServer x-0: Launching X Server [+0.49s] DEBUG: Launching process 638: /usr/bin/X :0 -seat seat0 -auth /var/run/lightdm/root/:0 -nolisten tcp vt7 -novtswitch [+0.49s] DEBUG: DisplayServer x-0: Waiting for ready signal from X server :0 lightdm.conf：
# # General configuration # # start-default-seat = True to always start one seat if none are defined in the configuration # greeter-user = User to run greeter as # minimum-display-number = Minimum display number to use for X servers # minimum-vt = First VT to run displays on # lock-memory = True to prevent memory from being paged to disk # user-authority-in-system-dir = True if session authority should be in the system location # guest-account-script = Script to be run to setup guest account # logind-load-seats = True to automatically set up multi-seat configuration from logind # logind-check-graphical = True to on start seats that are marked as graphical by logind # log-directory = Directory to log information to # run-directory = Directory to put running state in # cache-directory = Directory to cache to # sessions-directory = Directory to find sessions # remote-sessions-directory = Directory to find remote sessions # greeters-directory = Directory to find greeters # [LightDM] #start-default-seat=true #greeter-user=lightdm #minimum-display-number=0 #minimum-vt=7 #lock-memory=true #user-authority-in-system-dir=false #guest-account-script=guest-account #logind-load-seats=false #logind-check-graphical=false #log-directory=/var/log/lightdm #run-directory=/var/run/lightdm #cache-directory=/var/cache/lightdm #sessions-directory=/usr/share/lightdm/sessions:/usr/share/xsessions #remote-sessions-directory=/usr/share/lightdm/remote-sessions #greeters-directory=/usr/share/lightdm/greeters:/usr/share/xgreeters # # Seat defaults # # type = Seat type (xlocal, xremote) # xdg-seat = Seat name to set pam_systemd XDG_SEAT variable and name to pass to X server # pam-service = PAM service to use for login # pam-autologin-service = PAM service to use for autologin # pam-greeter-service = PAM service to use for greeters # xserver-command = X server command to run (can also contain arguments eg X -special-option) # xserver-layout = Layout to pass to X server # xserver-config = Config file to pass to X server # xserver-allow-tcp = True if TCP/IP connections are allowed to this X server # xserver-share = True if the X server is shared for both greeter and session # xserver-hostname = Hostname of X server (only for type=xremote) # xserver-display-number = Display number of X server (only for type=xremote) # xdmcp-manager = XDMCP manager to connect to (implies xserver-allow-tcp=true) # xdmcp-port = XDMCP UDP/IP port to communicate on # xdmcp-key = Authentication key to use for XDM-AUTHENTICATION-1 (stored in keys.conf) # unity-compositor-command = Unity compositor command to run (can also contain arguments eg unity-system-compositor -special-option) # unity-compositor-timeout = Number of seconds to wait for compositor to start # greeter-session = Session to load for greeter # greeter-hide-users = True to hide the user list # greeter-allow-guest = True if the greeter should show a guest login option # greeter-show-manual-login = True if the greeter should offer a manual login option # greeter-show-remote-login = True if the greeter should offer a remote login option # user-session = Session to load for users # allow-user-switching = True if allowed to switch users # allow-guest = True if guest login is allowed # guest-session = Session to load for guests (overrides user-session) # session-wrapper = Wrapper script to run session with # greeter-wrapper = Wrapper script to run greeter with # guest-wrapper = Wrapper script to run guest sessions with # display-setup-script = Script to run when starting a greeter session (runs as root) # display-stopped-script = Script to run after stopping the display server (runs as root) # greeter-setup-script = Script to run when starting a greeter (runs as root) # session-setup-script = Script to run when starting a user session (runs as root) # session-cleanup-script = Script to run when quitting a user session (runs as root) # autologin-guest = True to log in as guest by default # autologin-user = User to log in with by default (overrides autologin-guest) # autologin-user-timeout = Number of seconds to wait before loading default user # autologin-session = Session to load for automatic login (overrides user-session) # autologin-in-background = True if autologin session should not be immediately activated # exit-on-failure = True if the daemon should exit if this seat fails # [SeatDefaults] #type=xlocal #xdg-seat=seat0 #pam-service=lightdm #pam-autologin-service=lightdm-autologin #pam-greeter-service=lightdm-greeter #xserver-command=X #xserver-layout= #xserver-config= xserver-allow-tcp=false #xserver-share=true #xserver-hostname= #xserver-display-number= #xdmcp-manager= #xdmcp-port=177 #xdmcp-key= #unity-compositor-command=unity-system-compositor #unity-compositor-timeout=60 greeter-session=lightdm-gtk-greeter #greeter-hide-users=false #greeter-allow-guest=true #greeter-show-manual-login=false #greeter-show-remote-login=true user-session=/usr/bin/startxfce4 #allow-user-switching=true #allow-guest=true #guest-session= #session-wrapper=/etc/lightdm/Xsession #greeter-wrapper= #guest-wrapper= #display-setup-script= #display-stopped-script= #greeter-setup-script= #session-setup-script= #session-cleanup-script= #autologin-guest=false #autologin-user= #autologin-user-timeout=0 #autologin-in-background=false #autologin-session=UNIMPLEMENTED #exit-on-failure=false # # Seat configuration # # Each seat must start with "Seat:". # Uses settings from [SeatDefaults], any of these can be overriden by setting them in this section. # #[Seat:0] # # XDMCP Server configuration # # enabled = True if XDMCP connections should be allowed # port = UDP/IP port to listen for connections on # key = Authentication key to use for XDM-AUTHENTICATION-1 or blank to not use authentication (stored in keys.conf) # # The authentication key is a 56 bit DES key specified in hex as 0xnnnnnnnnnnnnnn. Alternatively # it can be a word and the first 7 characters are used as the key. # [XDMCPServer] #enabled=false #port=177 #key=a # # VNC Server configuration # # enabled = True if VNC connections should be allowed # command = Command to run Xvnc server with # port = TCP/IP port to listen for connections on # width = Width of display to use # height = Height of display to use # depth = Color depth of display to use # [VNCServer] #enabled=false #command=Xvnc #port=5900 #width=1024 #height=768 #depth=8