Vagrant and VirtualBox install on Ubuntu 18

https://websiteforstudents.com/install-the-latest-virtualbox-on-ubuntu-18-04-lts/
https://stegard.net/2016/10/virtualbox-secure-boot-ubuntu-fail/
1. Add the VirtualBox repository key:

wget -q https://www.virtualbox.org/download/oracle_vbox_2016.asc -O- | sudo apt-key add -
wget -q https://www.virtualbox.org/download/oracle_vbox.asc -O- | sudo apt-key add -

2. Add the VirtualBox repository

sudo sh -c 'echo "deb http://download.virtualbox.org/virtualbox/debian $(lsb_release -sc) contrib" >> /etc/apt/sources.list.d/virtualbox.list'

3. Install some required packages and then install VirtualBox

sudo apt update
sudo apt-get -y install gcc make linux-headers-$(uname -r) dkms
sudo apt-get install virtualbox-5.2

4. We now need to sign the VirtualBox modules.

$ sudo -i
# mkdir /root/module-signing
# cd /root/module-signing
# openssl req -new -x509 -newkey rsa:2048 -keyout MOK.priv -outform DER -out MOK.der -nodes -days 36500 -subj "/CN=YOUR_NAME/"
[...]
# chmod 600 MOK.priv
 
# mokutil --import /root/module-signing/MOK.der
input password:
input password again:

5. Create the script /root/module-signing/sign-vbox-modules with the following content:

#!/bin/bash
 
for modfile in $(dirname $(modinfo -n vboxdrv))/*.ko; do
  echo "Signing $modfile"
  /usr/src/linux-headers-$(uname -r)/scripts/sign-file sha256 \
                                /root/module-signing/MOK.priv \
                                /root/module-signing/MOK.der "$modfile"
done

chmod 700 /root/module-signing/sign-vbox-modules
Run the script as root
modprobe vboxdrv