Public bug reported:

After system update Nvidia proprietary driver is not working anymore.
Default 18.04 install fully updated.

Hardware: GTX 1080
Kernel: 4.15.0-46-generic

Xorg.log:
[     5.855] (EE) NVIDIA: Failed to initialize the NVIDIA kernel module. Please 
see the
[     5.855] (EE) NVIDIA:     system's kernel log for additional error messages 
and
[     5.855] (EE) NVIDIA:     consult the NVIDIA README for details.
[     5.855] (EE) [drm] Failed to open DRM device for (null): -2
[     5.855] (EE) [drm] Failed to open DRM device for (null): -2
[     5.855] (EE) [drm] Failed to open DRM device for pci:0000:0a:00.0: -2
[     5.855] (EE) [drm] Failed to open DRM device for pci:0000:0a:00.0: -2
[     5.856] (EE) Screen 0 deleted because of no matching config section.
[     5.861] (EE) Failed to initialize GLX extension (Compatible NVIDIA X 
driver not found)

syslog:
Mar 11 17:07:34 mysystem kernel: [   65.860371] NVRM: API mismatch: the client 
has the version 390.116, but
Mar 11 17:07:34 mysystem kernel: [   65.860371] NVRM: this kernel module has 
the version 390.77.  Please
Mar 11 17:07:34 mysystem kernel: [   65.860371] NVRM: make sure that this 
kernel module and all NVIDIA driver
Mar 11 17:07:34 mysystem kernel: [   65.860371] NVRM: components have the same 
version.

nvidia-smi:
Failed to initialize NVML: Driver/library version mismatch

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: nvidia-driver-390 390.116-0ubuntu0.18.04.1
ProcVersionSignature: Ubuntu 4.15.0-46.49-generic 4.15.18
Uname: Linux 4.15.0-46-generic x86_64
NonfreeKernelModules: nvidia_modeset nvidia
ApportVersion: 2.20.9-0ubuntu7.5
Architecture: amd64
CurrentDesktop: MATE
Date: Mon Mar 11 17:24:06 2019
InstallationDate: Installed on 2018-08-09 (213 days ago)
InstallationMedia: Ubuntu-MATE 18.04.1 LTS "Bionic Beaver" - Release amd64 
(20180725)
SourcePackage: nvidia-graphics-drivers-390
UpgradeStatus: No upgrade log present (probably fresh install)

** Affects: nvidia-graphics-drivers-390 (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug bionic nvidia

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https://bugs.launchpad.net/bugs/1819490

Title:
  API mismatch: the client has the version 390.116, but this kernel
  module has the version 390.77

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