Regardless of checksum discrepancies, I have been able to successfully install Kubuntu from the live CD. Now I am focusing on fixing the next of my probelms:
1) nVidia Driver (7050/630a)
2) and more urgently my Ralink chipset wifi, which should help with #1
In case anyone stumbles on this with disc install issues, part of my problem with previous install attempts was due to a faulty IDE cable on the boot drive which caused a NO DISC error after I had unknowingly performed a complete Kubuntu Live install. It appears my disc burning was not as bad as I had thought. And I didn't download of the chibiko mirror.