Public bug reported:

While updating my system running Focal (20.04), my nvidia drivers are not 
working and now I cannot install the updates (ubuntu-drivers autoinstall).
I tried to purge everything installed and named nvidia and after autoinstalling 
the correct driver for my system.
Thanks for helping out.

1)
aurion@w540:~$ lsb_release -rd
Description:    Ubuntu Focal Fossa (development branch)
Release:        20.04

2) 
aurion@w540:~$ apt-cache policy nvidia-340
nvidia-340:
  Installed: (none)
  Candidate: 340.108-0ubuntu2
  Version table:
     340.108-0ubuntu2 500
        500 http://br.archive.ubuntu.com/ubuntu focal/restricted amd64 Packages

3) I would like to be able to install this version of nvidia driver
since I have a dockstation and I use the thunderbolt connection for my
external monitor

4) I got an error message that the script could not install the drivers. I also 
had a look into the synaptic additional drivers and the nvidia is selected as 
installed. However the rendering of my screen is very slow and when I switch to 
another screen, I can see the window been reloaded.
Also I am unable to connect my external monitor via thunderbolt.

ProblemType: Package
DistroRelease: Ubuntu 20.04
Package: nvidia-340 (not installed)
ProcVersionSignature: Ubuntu 5.4.0-17.21-generic 5.4.22
Uname: Linux 5.4.0-17-generic x86_64
NonfreeKernelModules: nvidia
ApportVersion: 2.20.11-0ubuntu18
Architecture: amd64
Date: Sun Mar  1 21:36:20 2020
DuplicateSignature:
 package:nvidia-340:(not installed)
 Unpacking nvidia-340 (340.108-0ubuntu2) ...
 dpkg: error processing archive 
/var/cache/apt/archives/nvidia-340_340.108-0ubuntu2_amd64.deb (--unpack):
  trying to overwrite '/lib/udev/rules.d/71-nvidia.rules', which is also in 
package nvidia-kernel-common-440 440.59-0ubuntu2
ErrorMessage: trying to overwrite '/lib/udev/rules.d/71-nvidia.rules', which is 
also in package nvidia-kernel-common-440 440.59-0ubuntu2
Python3Details: /usr/bin/python3.8, Python 3.8.2, python3-minimal, 
3.8.2-0ubuntu1
PythonDetails: N/A
RelatedPackageVersions:
 dpkg 1.19.7ubuntu2
 apt  1.9.12
SourcePackage: nvidia-graphics-drivers-340
Title: package nvidia-340 (not installed) failed to install/upgrade: trying to 
overwrite '/lib/udev/rules.d/71-nvidia.rules', which is also in package 
nvidia-kernel-common-440 440.59-0ubuntu2
UpgradeStatus: No upgrade log present (probably fresh install)

** Affects: nvidia-graphics-drivers-340 (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-package focal package-conflict

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https://bugs.launchpad.net/bugs/1865577

Title:
  package nvidia-340 (not installed) failed to install/upgrade: trying
  to overwrite '/lib/udev/rules.d/71-nvidia.rules', which is also in
  package nvidia-kernel-common-440 440.59-0ubuntu2

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