Comment 0 for bug 1773637

I upgraded my system from 17.10 to 18.04 Bionic Beaver via do-release-upgrade.
After the installation had finished, Xorg wouldn't start. I later found out that this was because the installation routine had commented out the nvidia display driver I used in the xorg.conf:

Section "Device"
    Identifier "nvidia"
# Driver "nvidia"
    BusID "PCI:10@0:0:0"
    Option "ConstrainCursor" "off"
EndSection

As the installtion routine backuped my xorg.conf I could verify that the line hadn't been commented out before upgrading. Removing the "#" solved the problem.

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: xorg 1:7.7+19ubuntu7
ProcVersionSignature: Ubuntu 4.15.0-22.24-generic 4.15.17
Uname: Linux 4.15.0-22-generic x86_64
NonfreeKernelModules: wl nvidia_modeset nvidia
.proc.driver.nvidia.gpus.0000.0a.00.0: Error: [Errno 21] Is a directory: '/proc/driver/nvidia/gpus/0000:0a:00.0'
.proc.driver.nvidia.registry: Binary: ""
.proc.driver.nvidia.version:
 NVRM version: NVIDIA UNIX x86_64 Kernel Module 390.48 Thu Mar 22 00:42:57 PDT 2018
 GCC version: gcc version 7.3.0 (Ubuntu 7.3.0-16ubuntu3)
ApportVersion: 2.20.9-0ubuntu7
Architecture: amd64
BootLog: Error: [Errno 13] Permission denied: '/var/log/boot.log'
CompizPlugins: No value set for `/apps/compiz-1/general/screen0/options/active_plugins'
CompositorRunning: None
CurrentDesktop: ubuntu:GNOME
Date: Sun May 27 11:43:16 2018
DistUpgraded: 2018-05-21 10:52:35,978 DEBUG Running PostInstallScript: './xorg_fix_proprietary.py'
DistroCodename: bionic
DistroVariant: ubuntu
DkmsStatus:
 bcmwl, 6.30.223.271+bdcom, 4.15.0-20-generic, x86_64: installed
 bcmwl, 6.30.223.271+bdcom, 4.15.0-22-generic, x86_64: installed
 nvidia, 390.48, 4.15.0-20-generic, x86_64: installed
 nvidia, 390.48, 4.15.0-22-generic, x86_64: installed
EcryptfsInUse: Yes
ExtraDebuggingInterest: Yes
GraphicsCard:
 Intel Corporation HD Graphics 5500 [8086:1616] (rev 09) (prog-if 00 [VGA controller])
   Subsystem: Hewlett-Packard Company HD Graphics 5500 [103c:229d]
   Subsystem: Hewlett-Packard Company GM108M [GeForce 840M] [103c:229d]
InstallationDate: Installed on 2017-11-02 (205 days ago)
InstallationMedia: Ubuntu 17.10 "Artful Aardvark" - Release amd64 (20171018)
MachineType: Hewlett-Packard HP ENVY 17 Notebook PC
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.15.0-22-generic root=UUID=2c76a9d7-c435-4600-abc9-2ecd10fc3001 ro quiet splash vt.handoff=1
SourcePackage: xorg
UpgradeStatus: Upgraded to bionic on 2018-05-21 (6 days ago)
dmi.bios.date: 11/28/2014
dmi.bios.vendor: Insyde
dmi.bios.version: F.33
dmi.board.asset.tag: Type2 - Board Asset Tag
dmi.board.name: 229D
dmi.board.vendor: Hewlett-Packard
dmi.board.version: 78.15
dmi.chassis.type: 10
dmi.chassis.vendor: Hewlett-Packard
dmi.chassis.version: Chassis Version
dmi.modalias: dmi:bvnInsyde:bvrF.33:bd11/28/2014:svnHewlett-Packard:pnHPENVY17NotebookPC:pvr0973120000405F10000620180:rvnHewlett-Packard:rn229D:rvr78.15:cvnHewlett-Packard:ct10:cvrChassisVersion:
dmi.product.family: 103C_5335KV G=N L=CON B=HP S=ENV X=Null
dmi.product.name: HP ENVY 17 Notebook PC
dmi.product.version: 0973120000405F10000620180
dmi.sys.vendor: Hewlett-Packard
version.compiz: compiz N/A
version.libdrm2: libdrm2 2.4.91-2
version.libgl1-mesa-dri: libgl1-mesa-dri 18.0.0~rc5-1ubuntu1
version.libgl1-mesa-glx: libgl1-mesa-glx 18.0.0~rc5-1ubuntu1
version.nvidia-graphics-drivers: nvidia-graphics-drivers-* N/A
version.xserver-xorg-core: xserver-xorg-core 2:1.19.6-1ubuntu4
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev N/A
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:18.0.1-1
version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.917+git20171229-1
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.15-2