LighDM não inicia.

gabriel__

Quando eu ligo meu pc, a tela com a logo do linux mint é carregada e depois, ao envés de carregar o lightdm, aparece uma tela preta com um pontinho piscando.

Quando eu digito:

$ sudo service lightdm start

Aparece:

Job for lightdm.service failed because the control process exited with error code. See "systemctl status lightdm.service" and "journalctl -xe" for details.

systemctl status lightdm.service
● lightdm.service - Light Display Manager
Loaded: loaded (/lib/systemd/system/lightdm.service; static; vendor preset: e
Active: inactive (dead)
Docs: man:lightdm(1)

Fev 15 19:07:19 BitMachine systemd[1]: Stopped Light Display Manager.
Fev 15 19:07:19 BitMachine systemd[1]: Starting Light Display Manager...
Fev 15 19:07:19 BitMachine systemd[1]: lightdm.service: Control process exited,
Fev 15 19:07:19 BitMachine systemd[1]: Failed to start Light Display Manager.
Fev 15 19:07:19 BitMachine systemd[1]: lightdm.service: Unit entered failed stat
Fev 15 19:07:19 BitMachine systemd[1]: lightdm.service: Failed with result 'exit
Fev 15 19:07:19 BitMachine systemd[1]: lightdm.service: Service hold-off time ov
Fev 15 19:07:19 BitMachine systemd[1]: Stopped Light Display Manager.
Fev 15 19:07:19 BitMachine systemd[1]: lightdm.service: Start request repeated t
Fev 15 19:07:19 BitMachine systemd[1]: Failed to start Light Display Manager.

journalctl -xe
-- Support: http://lists.freedesktop.org/mailman/listinfo/systemd-devel
--
-- A unidade lightdm.service falhou.
--
-- O resultado é failed.

Será que alguém pode me ajudar?