How to Run Ubuntu on VirtualBox: The 2026 Beginner's Guide

1. Gather Your Tools

Before we start hacking away, we need to download two main files. Don't worry, they are both 100% free.

2. Create the Virtual Machine

Install VirtualBox like you would any other program. Once installed, open it up. You'll see a mostly empty grey window. Let's fix that.

Step-by-Step:

1. Click the big blue "New" star icon in the toolbar.
2. Name: Type "Ubuntu". VirtualBox is smart—it will automatically detect the Type as Linux and Version as Ubuntu (64-bit).
3. ISO Image: Click the dropdown and select "Other...", then find the Ubuntu `.iso` file you downloaded in Step 1.
4. Check the box that says "Skip Unattended Installation". (Trust me on this, the unattended installer often glitches. We'll do it manually to be safe.)

3. Allocate Resources (RAM & CPU)

Now we need to decide how much power to give your virtual machine. Think of this as slicing a piece of your actual computer's power cake to feed Ubuntu.

• Base Memory (RAM): I recommend at least 4096 MB (4GB). If you have 16GB or 32GB on your PC, feel free to give it 8GB. Do not go into the "Red" zone on the slider.
• Processors (CPU): Give it at least 2 CPUs. Ubuntu runs sluggishly on 1 core.

Create Virtual Hard Disk

On the next screen, it asks for a Hard Disk. The default 25GB is usually fine for testing. Click Next and then Finish.

4. Install Ubuntu

Your VM is created, but it's "turned off." Select your new Ubuntu VM on the left list and click the big green Start arrow.

A window will pop up. It might look like Matrix code for a few seconds—that's normal! Eventually, you will see the Ubuntu installer.

1. Select Install Ubuntu.
2. Keyboard Layout: Pick your language.
3. Updates and other software: Select Normal Installation. I also highly recommend checking "Install third-party software for graphics and Wi-Fi hardware"—this includes drivers for MP3 playback and video.
4. Installation Type: Select Erase disk and install Ubuntu. DON'T PANIC! This only erases the "Virtual Hard Disk" we created in Step 3. It does NOT erase your actual Windows hard drive.
5. Click Install Now -> Continue.
6. Pick your Timezone and create your User Account (Username/Password).

Now, grab a coffee. The installation will take 10-15 minutes.

5. The Secret Sauce: Guest Additions

Once the install is done, you'll restart the VM. You might notice the screen is small, square, and won't resize to full screen. It feels laggy. This is because we are missing drivers.

We need to install VirtualBox Guest Additions.

The Easy Way:

1. In the VirtualBox window menu (top left), go to Devices -> Insert Guest Additions CD image...
2. Inside Ubuntu, a CD icon will appear on the left dock. Click it.
3. Right-click inside the folder window and select "Open in Terminal".
4. Type the following command and hit Enter (you will need your password):

sudo ./VBoxLinuxAdditions.run

Let it run. Once it says "Press Return to close this window," restart your VM one last time.

Boom. Now you can resize the window, copy-paste between Windows and Ubuntu, and enjoy smooth performance.

Troubleshooting Common Issues

Things don't always go smoothly. Here is how to fix the most common headaches users face in 2026.