Installing Ubuntu from ISO

I am following this tutorial

https://www.linode.com/docs/tools-refer … stribution">https://www.linode.com/docs/tools-reference/custom-kernels-distros/install-a-custom-distribution-on-a-linode#install-a-custom-distribution

I had no problems until I got into the gui ubuntu installer.

After setting the language and keyboard type it tried to mount the cd but failed…

I could not get past that point.

Any tips?

Thanks!