package bbswitch-dkms (not installed) failed to install/upgrade: installed bbswitch-dkms package post-installation script subprocess returned error exit status 6

[SiggiTron]

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ProblemType: Package
DistroRelease: Ubuntu 18.04
Package: bbswitch-dkms (not installed)
ProcVersionSignature: Ubuntu 4.15.0-20.21-generic 4.15.17
Uname: Linux 4.15.0-20-generic x86_64
ApportVersion: 2.20.9-0ubuntu7
Architecture: amd64
Date: Thu May 17 13:13:16 2018
ErrorMessage: installed bbswitch-dkms package post-installation script subprocess returned error exit status 6
InstallationDate: Installed on 2018-05-11 (5 days ago)
InstallationMedia: Ubuntu 18.04 LTS "Bionic Beaver" - Release amd64 (20180426)
Python3Details: /usr/bin/python3.6, Python 3.6.5, python3-minimal, 3.6.5-3
PythonDetails: /root/Error: command ['which', 'python'] failed with exit code 1:, Error: [Errno 2] Adresář nebo soubor neexistuje: "/root/Error: command ['which', 'python'] failed with exit code 1:": "/root/Error: command ['which', 'python'] failed with exit code 1:", unpackaged
RelatedPackageVersions:
 dpkg 1.19.0.5ubuntu2
 apt 1.6.1
SourcePackage: bbswitch
Title: package bbswitch-dkms (not installed) failed to install/upgrade: installed bbswitch-dkms package post-installation script subprocess returned error exit status 6
UpgradeStatus: No upgrade log present (probably fresh install)