Lightdm can't start xserver

Question

First things first, hello :)

I ran systemctl disable lightdm.service from recovery mode.

After that i reboot my pc and typed sudo lightdm start ; startx. I started a graphical section but when i tryed to launch a gtk program from terminal i got this error:

 Unable to init server: No se pudo conectar: Conexión rehusada

(nautilus:14383): Gtk-WARNING **: 10:27:51.240: cannot open display: :1 

and when i realized it i launched lightdm in debug mode with sudo lightdm --debug start and i got this:

[+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

I could launch gtk programs before ran systemctl disable lightdm.service so probably that's the source of the problem.

If i well understood systemctl disable lightdm.service is for don't start lightdm automatically, not for make it unable to run, so idk.

Do you have any suggestion for solve the problem?