I have started using Linux Mint OS 18 on my one laptop. I thought to use some new OS as I got bored with Windows 10 and even many times Disk I/O was also 100% in it.
Installing Linux Mint is easy and it is available for both 32 bit and 64 bits systems. Being working into Oracle Technologies, I wanted the first thing installed on my new OS was Oracle Virtual Box.

Below are the steps to do the same.
Step 1: Right click and Open up a Terminal.
Step 2: Edit /etc/apt/sources.list file.
sudo vi /etc/apt/sources.list
Step 3: Add the following line to that file.
Add the following line to your /etc/apt/sources.list. According to your distribution, replace '' with 'artful', 'zesty', 'yakkety', 'xenial', 'trusty', 'stretch', 'jessie', or 'wheezy' (older versions of VirtualBox supported different distributions):
deb https://download.virtualbox.org/virtualbox/debian contrib
To find your distribution just do cat /etc/*-release
### LinuxMint 18 ###
### This one I added as per my OS ###
deb http://download.virtualbox.org/virtualbox/debian xenial contrib

### LinuxMint 17 ###

deb http://download.virtualbox.org/virtualbox/debian trusty contrib
Step 4: Import the Public key of the Oracle VirtualBox repository to your system.
### LinuxMint 18 ###
### This one I added as per my OS ###

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

### LinuxMint 17 ###

wget -q https://www.virtualbox.org/download/oracle_vbox.asc -O- | sudo apt-key add -
Step 5: Update the package database using apt-get.
sudo apt-get update
Step 6: Install the VirtualBox 5.2 using below command.
sudo apt-get install virtualbox-5.2
Note: dkms package ensures that the VirtualBox host kernel modules (vboxdrv, vboxnetflt, and vboxnetadp are correctly updated if the Linux kernel version changes during the next apt-get upgrade.
sudo apt-get install dkms
Step 7: Start VirtualBox (Menu—> Administration > Oracle VM VirtualBox) – on Cinnamon desktop.
Or Open Terminal and run below command
virtualbox

Additional Step to Enable SSH:

Open your terminal and run below command to make sure you are able to ping the Guest IP from Host IP. This is used in Host Only Adapter.

sudo apt-get install ssh