Ubuntu 17.10 monitor not detected (black screen)

[Emulator]

The service is correctly running as I can see it here:

● dlm.service - DisplayLink Manager Service
   Loaded: loaded (/lib/systemd/system/dlm.service; enabled; vendor preset: enabled)
   Active: active (running) since Thu 2018-01-11 17:20:54 CET; 15min ago
  Process: 1128 ExecStartPre=/bin/sh -c modprobe evdi || (dkms install evdi/4.1.9 && modprobe evdi) (code=exited, status=0/SUCCESS)
 Main PID: 1131 (DisplayLinkMana)
    Tasks: 33 (limit: 4915)
   Memory: 22.5M
      CPU: 3.133s
   CGroup: /system.slice/dlm.service
           └─1131 /opt/displaylink/DisplayLinkManager

gen 11 17:20:54 Dario systemd[1]: Starting DisplayLink Manager Service...
gen 11 17:20:54 Dario systemd[1]: Started DisplayLink Manager Service.

I think that something is wrong on this part of dmesg:

[    5.580251] evdi: [D] add_store:239 Increasing device count to 1
[    5.580401] evdi: [D] evdi_crtc_init:351 drm_crtc_init: 0
[    5.580452] evdi: [W] evdi_painter_crtc_state_notify:484 Painter does not exist!
[    5.580454] evdi: [D] evdi_detect:78 Painter is disconnected
[    5.580457] [drm] Cannot find any crtc or sizes - going 1024x768
[    5.581326] evdi evdi.0: fb1: evdidrmfb frame buffer device
[    5.581328] [drm] Supports vblank timestamp caching Rev 2 (21.10.2013).
[    5.581328] [drm] No driver support for vblank timestamp query.
[    5.581432] [drm] Initialized evdi 1.5.0 20170419 for evdi.0 on minor 1
[    5.581432] [drm] evdi: evdi_stats_init
[    5.585092] open /dev/fb1 user=1 fb_info=ffff9b9339886800 count=1
[    5.586753] evdi: [D] evdi_detect:78 Painter is disconnected
[    5.605397] evdi: [D] evdi_painter_connect:572 (dev=1) Connected with ffff9b9335587200
[    5.605400] evdi: [D] evdi_detect:75 (dev=1) Painter is connected
[    5.605483] evdi: [D] evdi_painter_crtc_state_notify:481 (dev=1) Notifying crtc state: 3
[    9.883756] released /dev/fb1 user=1 count=0

I'm very frustated because I can't get it work as before and I cannot use the external monitor anymore