I am trying to load v11.04 onto my HP desktop hard drive using a USB drive. I used the same USB drive to load the system on my Dell netbook and it loaded successfully. But trying to load on the desktop I get the error " Apt configuration problem. An attempt to configure apt to install additional packages from the CD failed" The installer then crashes. I have nothing in the CD drive. I can boot the system from the USB drive and it works fine. I have tried all options on the load with the same crash each time. I baffled as I successfully loaded my netbook with the same USB with no problems.
Firstly, I assume you are trying to install Natty on your HP desktop from a USB.
Notes in that comment suggest bug 658865 is the cause for this...
That bug goes on to discuss two alternatives.
You'll get more context in the two bug records.