package nvidia-340 (not installed) failed to install/upgrade: new nvidia-340 package pre-installation script subprocess returned error exit status 2

[fer basbas]

trying to install the driver for ubuntu 18.04

ProblemType: Package
DistroRelease: Ubuntu 18.04
Package: nvidia-340 (not installed)
ProcVersionSignature: Ubuntu 4.15.0-36.39-generic 4.15.18
Uname: Linux 4.15.0-36-generic x86_64
NonfreeKernelModules: nvidia_uvm nvidia_drm nvidia_modeset nvidia
ApportVersion: 2.20.9-0ubuntu7.4
Architecture: amd64
Date: Sat Oct 6 14:13:55 2018
ErrorMessage: new nvidia-340 package pre-installation script subprocess returned error exit status 2
Python3Details: /usr/bin/python3.6, Python 3.6.6, python3-minimal, 3.6.5-3ubuntu1
PythonDetails: /usr/bin/python2.7, Python 2.7.15rc1, python-minimal, 2.7.15~rc1-1
RelatedPackageVersions:
 dpkg 1.19.0.5ubuntu2
 apt 1.6.3ubuntu0.1
SourcePackage: nvidia-graphics-drivers-340
Title: package nvidia-340 (not installed) failed to install/upgrade: new nvidia-340 package pre-installation script subprocess returned error exit status 2
UpgradeStatus: No upgrade log present (probably fresh install)

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.