Hi & welcome,
Firstly, check that your down loaded image is not corrupt -->
https://help.ubuntu.com/community/HowToMD5SUM Covers that via Win, or Linux.
If it does not pass, then head over to -->
http://www.kubuntu.org/getkubuntu
Next - burn the iso at 4X speed (or slower) - If your present driver does not support that slow a speed. If you cannot burn at that slow a speed, or need any further help -->
https://help.ubuntu.com/community/BurningIsoHowto will help you out.
Finally (phew !!) - check the CD image, as per the md5sum link above.
Cheaper cd-r's seem to work better, also it's never amiss to clean the cd drive lens if you have a cleaning kit.
If your cd fails to verify, then you're going to have to get someone else to burn it for you. It does sometimes happen that cd drives just cannot burn iso images (the tolerances are much tighter than for, say, music).
Hope that gets you sorted.
Regards,
Phill.
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