The nvidia kernel driver is built but not being used by the kernel:

0a:00.0 3D controller [0302]: NVIDIA Corporation GM108M [GeForce 940M] 
[10de:1347] (rev a2)
        ...
        Kernel driver in use: nouveau
        Kernel modules: nvidiafb, nouveau, nvidia_drm, nvidia

and nvidia-installer.log says:

-> The distribution-provided pre-install script failed!  Are you sure you want 
to continue? (Answer: Continue installation)
ERROR: The Nouveau kernel driver is currently in use by your system.  This 
driver is incompatible with the NVIDIA driver, and must be disabled before 
proceeding.  Please consult the NVIDIA driver README and your Linux 
distribution's documentation for details on how to correctly disable the 
Nouveau kernel driver.

So I think what you need to do is disable the kernel modesetting system. That 
will prevent 'nouveau' from working and will make the proper 'nvidia' driver 
happy. To do that you just need to:
  1. Add 'nomodeset' to your GRUB_CMDLINE_LINUX in /etc/default/grub. 
  2. sudo update-initramfs
  3. Reboot
  4. Tell us if it worked.

If that didn't work then the next step is:
  5. Run: dmesg > dmesg.txt
  6. Send us the new dmesg.txt file.


** Package changed: xorg (Ubuntu) => nvidia-graphics-drivers-390 (Ubuntu)

** Changed in: nvidia-graphics-drivers-390 (Ubuntu)
       Status: New => Incomplete

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You received this bug notification because you are a member of Ubuntu
Touch seeded packages, which is subscribed to xorg in Ubuntu.
https://bugs.launchpad.net/bugs/1783784

Title:
  NVIDIA Driver Not loading up

Status in nvidia-graphics-drivers-390 package in Ubuntu:
  Invalid

Bug description:
  Few days ago the NVIDIA driver and display was working fine. But now
  its unable to load nvidia driers. I uninstalled and reinstalled nvidia
  drivers but it isn't working now. 'lsmod | grep nvidia' isn't working.
  Neither nvidia-settings opening.

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: xorg 1:7.7+19ubuntu7
  ProcVersionSignature: Ubuntu 4.15.0-29.31-generic 4.15.18
  Uname: Linux 4.15.0-29-generic x86_64
  ApportVersion: 2.20.9-0ubuntu7.2
  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: Thu Jul 26 20:12:25 2018
  DistUpgraded: Fresh install
  DistroCodename: bionic
  DistroVariant: ubuntu
  DkmsStatus: nvidia, 390.77, 4.15.0-29-generic, x86_64: installed
  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:8096]
     Subsystem: Hewlett-Packard Company GM108M [GeForce 940M] [103c:8096]
  InstallationDate: Installed on 2018-07-19 (7 days ago)
  InstallationMedia: Ubuntu 18.04 LTS "Bionic Beaver" - Release amd64 (20180426)
  MachineType: HP HP Pavilion Notebook
  ProcEnviron:
   TERM=xterm-256color
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=en_IN
   SHELL=/bin/bash
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.15.0-29-generic 
root=UUID=86533d4a-01e4-4bc4-a1fc-a6459c24c844 ro quiet splash vt.handoff=1
  SourcePackage: xorg
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 07/30/2015
  dmi.bios.vendor: Insyde
  dmi.bios.version: F.41
  dmi.board.asset.tag: Type2 - Board Asset Tag
  dmi.board.name: 8096
  dmi.board.vendor: HP
  dmi.board.version: 89.23
  dmi.chassis.type: 10
  dmi.chassis.vendor: HP
  dmi.chassis.version: Chassis Version
  dmi.modalias: 
dmi:bvnInsyde:bvrF.41:bd07/30/2015:svnHP:pnHPPavilionNotebook:pvrType1ProductConfigId:rvnHP:rn8096:rvr89.23:cvnHP:ct10:cvrChassisVersion:
  dmi.product.family: 103C_5335KV G=N L=CON B=HP S=PAV X=Null
  dmi.product.name: HP Pavilion Notebook
  dmi.product.version: Type1ProductConfigId
  dmi.sys.vendor: HP
  version.compiz: compiz N/A
  version.libdrm2: libdrm2 2.4.91-2
  version.libgl1-mesa-dri: libgl1-mesa-dri 18.0.5-0ubuntu0~18.04.1
  version.libgl1-mesa-glx: libgl1-mesa-glx 18.0.5-0ubuntu0~18.04.1
  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

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