首先，你好 :)
我systemctl disable lightdm.service从恢复模式退出。
之后我重启电脑并输入sudo lightdm start ; startx。我开始了一个图形部分，但是当我尝试从终端启动 gtk 程序时，出现了这个错误：
Unable to init server: No se pudo conectar: Conexión rehusada
(nautilus:14383): Gtk-WARNING **: 10:27:51.240: cannot open display: :1
当我意识到这一点时，我以调试模式启动了 lightdm，sudo lightdm --debug start得到了以下信息：
[+0.00s] DEBUG: Logging to /var/log/lightdm/lightdm.log
[+0.00s] DEBUG: Starting Light Display Manager 1.26.0, UID=0 PID=13909
[+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-disable-guest.conf
[+0.00s] DEBUG: Loading configuration from /usr/share/lightdm/lightdm.conf.d/50-disable-log-backup.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-unity-greeter.conf
[+0.00s] DEBUG: Loading configuration from /usr/share/lightdm/lightdm.conf.d/50-unity.conf
[+0.00s] DEBUG: Loading configuration from /usr/share/lightdm/lightdm.conf.d/50-xserver-command.conf
[+0.00s] DEBUG: Loading configuration dirs from /usr/local/share/lightdm/lightdm.conf.d
[+0.00s] DEBUG: Loading configuration dirs from /etc/xdg/lightdm/lightdm.conf.d
[+0.00s] DEBUG: Loading configuration from /etc/lightdm/lightdm.conf
[+0.00s] DEBUG: Using Xephyr for X servers
[+0.00s] DEBUG: Registered seat module local
[+0.00s] DEBUG: Registered seat module xremote
[+0.00s] DEBUG: Registered seat module unity
[+0.00s] DEBUG: Using D-Bus name org.freedesktop.DisplayManager
[+0.01s] DEBUG: Monitoring logind for seats
[+0.01s] DEBUG: New seat added from logind: seat0
[+0.01s] DEBUG: Seat seat0: Loading properties from config section Seat:*
[+0.01s] DEBUG: Seat seat0: Starting
[+0.01s] DEBUG: Seat seat0: Creating user 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
[+0.04s] DEBUG: Using VT 7
[+0.04s] DEBUG: Seat seat0: Starting local X display on VT 7
[+0.04s] DEBUG: XServer 0: Logging to /var/log/lightdm/x-0.log
[+0.04s] DEBUG: XServer 0: Writing X server authority to /var/run/lightdm/root/:0
[+0.04s] DEBUG: XServer 0: Launching X Server
[+0.04s] DEBUG: Launching process 13915: /usr/bin/Xephyr :0 -seat seat0 -auth /var/run/lightdm/root/:0 -nolisten tcp vt7 -novtswitch
[+0.04s] DEBUG: XServer 0: Waiting for ready signal from X server :0
[+0.04s] DEBUG: Acquired bus name org.freedesktop.DisplayManager
[+0.04s] DEBUG: Registering seat with bus path /org/freedesktop/DisplayManager/Seat0
[+0.09s] DEBUG: Process 13915 exited with return value 1
[+0.09s] DEBUG: XServer 0: X server stopped
[+0.09s] DEBUG: Releasing VT 7
[+0.09s] DEBUG: XServer 0: Removing X server authority /var/run/lightdm/root/:0
[+0.09s] DEBUG: Seat seat0: Display server stopped
[+0.09s] DEBUG: Seat seat0: Stopping session
[+0.09s] DEBUG: Seat seat0: Session stopped
[+0.09s] DEBUG: Seat seat0: Stopping display server, no sessions require it
[+0.09s] DEBUG: Seat seat0: Active display server stopped, starting greeter
[+0.09s] DEBUG: Seat seat0: Creating greeter session
[+0.09s] DEBUG: Seat seat0: Creating display server of type x
[+0.09s] DEBUG: Using VT 7
[+0.09s] DEBUG: Seat seat0: Starting local X display on VT 7
[+0.09s] DEBUG: XServer 0: Logging to /var/log/lightdm/x-0.log
[+0.09s] DEBUG: XServer 0: Writing X server authority to /var/run/lightdm/root/:0
[+0.09s] DEBUG: XServer 0: Launching X Server
[+0.09s] DEBUG: Launching process 13916: /usr/bin/Xephyr :0 -seat seat0 -auth /var/run/lightdm/root/:0 -nolisten tcp vt7 -novtswitch
[+0.09s] DEBUG: XServer 0: Waiting for ready signal from X server :0
[+0.10s] DEBUG: Process 13916 exited with return value 1
[+0.10s] DEBUG: XServer 0: X server stopped
[+0.10s] DEBUG: Releasing VT 7
[+0.10s] DEBUG: XServer 0: Removing X server authority /var/run/lightdm/root/:0
[+0.10s] DEBUG: Seat seat0: Display server stopped
[+0.10s] DEBUG: Seat seat0: Stopping session
[+0.10s] DEBUG: Seat seat0: Session stopped
[+0.10s] DEBUG: Seat seat0: Stopping display server, no sessions require it
[+0.10s] DEBUG: Seat seat0: Stopping; greeter display server failed to start
[+0.10s] DEBUG: Seat seat0: Stopping
[+0.10s] DEBUG: Seat seat0: Stopped
[+0.10s] DEBUG: Required seat has stopped
[+0.10s] DEBUG: Stopping display manager
[+0.10s] DEBUG: Display manager stopped
[+0.10s] DEBUG: Stopping daemon
[+0.11s] DEBUG: Exiting with return value 1
我可以在运行之前启动 gtk 程序systemctl disable lightdm.service，所以这可能是问题的根源。
如果我理解正确的话，systemctl disable lightdm.service这是为了不自动启动 lightdm，而不是为了使其无法运行，所以我不知道。
您对解决这个问题有什么建议吗？