Debian não inicia a GUI

Question

Quando eu inicio o Debian, a GUI não está sendo iniciada. Vai para a linha de comando pedindo login.

andre@move-01:~$ systemctl status gdm3 service
* gdm.service - GNOME Display Manager
   Loaded: loaded (/lib/systemd/system/gdm.service; enabled)
   Active: active (running) since Mon 2017-01-09 13:32:21 BRST; 12min ago
  Process: 952 ExecStartPre=/usr/share/gdm/generate-config (code=exited, status=0/SUCCESS)
  Process: 952 ExecStartPre=/bin/sh -c [ "$(cat /etc/X11/default-display-manager 2>/dev/null)" = "/usr/sbin/gdm3" ] (code=exited, status=0/SUCCESS)
 Main PID: 958 (gdm3)
   CGroup: /system.slice/gdm.serivce
              958 /usr/sbin/gdm3
             1609 /usr/bin/Xorg :1 -novtswitch -background none -noreset -verbose 3 -auth /var/run/gdm3/auth-for-Debian-gdm-0Mifhr/database -seat seat0 -nolisten tcp vt7

* service.service
   Loaded: not-found (Reason: No such file or directory)
   Active: inactive (dead)

Quando tento sudo startx , obtenho isto:

(EE)
Fatal server error:
(EE) Can't read lock file /tmp/.X0-lock
(EE)
(EE)
Please consult the The X.Org Foundation support
         at http://wiki.x.org
 for help.
(EE)
xinit: giving up
xinit: unable to connect to X server: Connection refused
xinit: server error

Outros comandos que experimentei:

update-rc.d -f gdm defaults
sudo /etc/init.d/gdm3 stop && startx

O que está acontecendo?

(Existem perguntas semelhantes, mas nenhuma delas funcionou para mim.)

EDITAR

Saída para sudo journalctl -u gdm3 :

-- Logs begin at Mon 2017-01-09 13:55:54 BRST, end at Mon 2017-01-09 14:25:33 BRST. --

EDIT 2

lspci | grep VGA output:

01:00.0 VGA compatible controller: Advanced Micro Devices, Inc.  [AMD/ATI] Tahi
 PRO  [Radeon HD 7950/8950 OEM / R9 280]

    

Answer 1

Para a placa da Nvidia, tente a opção Bootoption nouveau.modeset=0

Para Intel i915.modeset=0

Isso desativa o KMS