Check this out:
http://www.kubuntu.org/news/8.04-release
scroll down and check out the "Alternative CD." I think that's probably your best bet for installing w/o a network connection. I'm sure there's a command you can add to the boot sequence to force Kubuntu to ignore the NTP segment of installation, but as a Linux noob myself, I have no clue what that command would be.
Good luck and let me know if there's anything else I can do to help.