If you want to install a new operating system, no matter is Ubuntu or Linux, you don’t need to burn a CD, any more. You can create a bootable USB drive with UNebooting.
Unebootin is a software that gives you the opportunity to create fast and easy a bootable USB with your desired operating system. It has a built-in support for automatically downloading and loading your operating system ant is supported by Ubuntu, Debian, Linux or Fedora.
Unebootin can be downloaded for free and can be used with various other system utilities, like free dos, Parted Magic or Kaspersky Rescue Disk.