It’s easy to install Ubuntu from a CD. Here’s what you need to do:
Download Ubuntu 12.04 LTS 32-bit for Desktop
Download Ubuntu 12.04 LTS 64-bit for Desktop
Put the Ubuntu CD into the CD/DVD-drive.
Restart your computer. You should see a welcome screen prompting you to choose your language and giving you the option to install Ubuntu or try it from the CD.
Most newer computers can boot from USB. You should see a welcome screen prompting you to choose your language and giving you the option to install Ubuntu or try it from the CD.
If your computer doesn’t automatically do so, you might need to press the F12 key to bring up the boot menu, but be careful not to hold it down - that can cause an error message.
If you are not connected to the internet, you will be asked to select a wireless network, if available. We advise you to connect during the installation so we can ensure your machine is up to date. So, if you set up your wireless network at this point, it’s worth then clicking the Back button to go back to the last screen (Preparing to install Ubuntu) and ticking the box marked ‘Download updates while installing’
Use the checkboxes to choose whether you'd like to Install Ubuntu alongside another operating system, delete your existing operating system and replace it with Ubuntu, or — if you're an advanced user — choose the 'Something else' option
Depending on your previous selections, you can now verify that you have chosen the way in which you would like to install Ubuntu. The installation process will begin when you click the Install Now button.
Ubuntu needs about 4.5 GB to install, so add a few extra GB to allow for your files.
Not sure about this step? Windows users can use the Windows installer, which will install and uninstall Ubuntu in the same way as any other Windows application. It's simpler and completely safe.
If you are connected to the internet, this should be done automatically. Check your location is correct and click 'Forward' to proceed. If you're unsure of your time zone, type the name of the town you're in or click on the map and we'll help you find it.
Click on the language option you need. If you’re not sure, click the ’Detect Keyboard Layout’ button for help.
…or make a cup of tea!
All that’s left is to restart your computer and start enjoying Ubuntu!