The default username and password for an Ubuntu Linux CD depend on the specific distribution and release. However, for the latest version of Ubuntu, the default username is usually “ubuntu” and there is no default password. When you boot from the Ubuntu CD, you’ll be prompted to create a user account and password during the installation process.
It’s important to note that using a live CD, such as the Ubuntu CD, is different from installing Ubuntu on your computer. When you boot from the live CD, you are running Ubuntu directly from the CD without installing it on your hard drive. This allows you to try out the operating system before installing it.
In general, it’s a good practice to change the default username and password after installing any operating system to ensure the security of your system.