This blog entry is installing Ubuntu LTS 12.04 on VirtualBox.
This assumes you was installing Ubuntu to a new virtual machine.
To start with, this is the welcome screen you will get when you start the installation process.
Since we wanted to install Ubuntu rather than try it, clicked on the “Install Ubuntu” button to proceed to the installation process options dialog.

In this dialog, you get to choose whether you want to download updates during the operating system’s installation.
You also get to choose whether to download and install some 3rd party software use for displaying Flash, MP3 and other media.
For convenience, checked both options and click on the “Continue” button to proceed with the installation process.

The 3rd step is to partition the installation media for installing the operating system.
Since we are starting with a fresh VM and are not intending to use the installation media for any other special purpose, pick the first (default) option, “Erase disk and install Ubuntu” and proceed with the installation process by clicking on the “Continue” button.

After the installation media is partitioned, you need to select which partition you want to install Ubuntu on.
Go with the default option, and click on “Install Now” to proceed with the installation.

The next step is decide your location (timezone).
You can click on the map or enter a location in the textbox.
The textbox will show a dropdown list of locations that matches your chosen location or entered location.
After selecting your location for your time, click on the “Continue” button to move to the next dialog.

Next you get to choose your keyboard.
I went with the default.

Finally you need to create your first account for use with Ubuntu.

At this point, the rest of installation process are automated.
So you just have to wait for the installation process to complete.

When the installation process is complete, you will get a “Installation Complete” dialog prompting you to start the VM.
Click on the “Restart Now” button to restart your VM and you should have a fully functional Ubuntu system for you to work with.

After the system bootup, you should get the following like the following screen. Enter the password that you keyed during the creation of the 1st user account to log into the system.

Congratulations. You now have a Ubuntu system at your disposal.
