Xorg crashed with SIGABRT

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ProblemType: Crash
DistroRelease: Ubuntu 17.10
Package: xserver-xorg-core 2:1.19.3-1ubuntu3
Uname: Linux 4.12.6-041206-generic x86_64
NonfreeKernelModules: nvidia_uvm nvidia_drm nvidia_modeset nvidia
.proc.driver.nvidia.gpus.0000.01.00.0: Error: [Errno 21] È una directory: '/proc/driver/nvidia/gpus/0000:01:00.0'
.proc.driver.nvidia.registry: Binary: ""
.proc.driver.nvidia.version:
 NVRM version: NVIDIA UNIX x86_64 Kernel Module 384.59 Wed Jul 19 23:53:34 PDT 2017
 GCC version: gcc version 7.1.0 (Ubuntu 7.1.0-13ubuntu1)
ApportVersion: 2.20.6-0ubuntu5
Architecture: amd64
CompizPlugins: No value set for `/apps/compiz-1/general/screen0/options/active_plugins'
CompositorRunning: None
Date: Sat Aug 12 12:04:53 2017
DistUpgraded: 2017-07-08 22:41:58,042 DEBUG Running PostInstallScript: './xorg_fix_proprietary.py'
DistroCodename: artful
DistroVariant: ubuntu
DkmsStatus:
 bbswitch, 0.8, 4.12.0-11-generic, x86_64: installed
 bbswitch, 0.8, 4.12.6-041206-generic, x86_64: installed
 nvidia-384, 384.59, 4.12.0-11-generic, x86_64: installed
 nvidia-384, 384.59, 4.12.6-041206-generic, x86_64: installed
ExecutablePath: /usr/lib/xorg/Xorg
GraphicsCard:
 Intel Corporation HD Graphics 530 [8086:191b] (rev 06) (prog-if 00 [VGA controller])
   Subsystem: Dell HD Graphics 530 [1028:06e4]
   Subsystem: Dell GM107M [GeForce GTX 960M] [1028:06e4]
InstallationDate: Installed on 2016-05-20 (448 days ago)
InstallationMedia: Ubuntu 16.04 LTS "Xenial Xerus" - Release amd64 (20160420.1)
MachineType: Dell Inc. XPS 15 9550
ProcCmdline: /usr/lib/xorg/Xorg vt1 -displayfd 3 -auth /run/user/122/gdm/Xauthority -background none -noreset -keeptty -verbose 7 -core
ProcEnviron:

ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.12.6-041206-generic root=UUID=ac47cc07-d245-4f3d-b24a-6119f3faa737 ro splash vt.handoff=7
Signal: 6
SourcePackage: nvidia-graphics-drivers
StacktraceTop:
 ()
 ()
 ()
 xf86VTLeave ()
 WakeupHandler ()
Title: Xorg crashed with SIGABRT
UpgradeStatus: Upgraded to artful on 2017-07-08 (34 days ago)
UserGroups:

dmi.bios.date: 07/24/2017
dmi.bios.vendor: Dell Inc.
dmi.bios.version: 1.2.29
dmi.board.name: 0N7TVV
dmi.board.vendor: Dell Inc.
dmi.board.version: A00
dmi.chassis.type: 9
dmi.chassis.vendor: Dell Inc.
dmi.modalias: dmi:bvnDellInc.:bvr1.2.29:bd07/24/2017:svnDellInc.:pnXPS159550:pvr:rvnDellInc.:rn0N7TVV:rvrA00:cvnDellInc.:ct9:cvr:
dmi.product.family: To be filled by O.E.M.
dmi.product.name: XPS 15 9550
dmi.sys.vendor: Dell Inc.
version.compiz: compiz N/A
version.ia32-libs: ia32-libs N/A
version.libdrm2: libdrm2 2.4.82-1
version.libgl1-mesa-dri: libgl1-mesa-dri 17.1.4-1ubuntu1
version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
version.libgl1-mesa-glx: libgl1-mesa-glx 17.1.4-1ubuntu1
version.nvidia-graphics-drivers: nvidia-graphics-drivers-* N/A
version.xserver-xorg-core: xserver-xorg-core 2:1.19.3-1ubuntu3
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.10.5-1ubuntu1
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.9.0-1
version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.917+git20170309-0ubuntu1
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.15-2