How to install VirtualBox Guest Additions on Ubuntu Server Commandline

This morning, I struggled to get Guest Additions installed on my Ubuntu Server VBox, which I am going to use to prepare a codebase for migration to Linux.

It has been a while since Digital Ocean droplets are inexpensive to fire up and use.

Here are the commands I used today to get everything going.

# Make sure your system is up to date
sudo apt update
sudo apt upgrade

# Install packages to get the party started
sudo apt install build-essential dkms linux-headers-$(uname -r)

# At this point I rebooted.  Not sure if it was necessary.
sudo reboot

# Here is where I inserted the Guest Edition ISO from 
# Devices -> Insert Guest Additions CD Image...

# I did not have a mount point set so nothing was working. 
sudo mkdir /media/cdrom

# Mount the CD
sudo mount /dev/cdrom /media/cdrom

# Run the install
cd /media/cdrom
sudo ./

# Reboot for everything to take hold.
sudo reboot

Guest Editions ISO Screenshot