Just built a computer; trying to install Ubuntu from a flash drive

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http://askubuntu.com – I've just finished assembling my PC and I'm trying to install Ubuntu on it (there is no operating system on this machine). I downloaded Unetbootin on my Mac, downloaded the .iso image, and ran Unetbootin to put it on my flash drive. I plugged it in and ran into a lot of problems which I'd like help/an explanation for? 1- First time i tried to boot from my flash drive I got a Unetbootin default lop which would start up every 10 seconds. I redownloaded Ubuntu and plugged in my flash drive again. Ubuntu started to install. 2- I got a " Apt configuration problem. An attempt to configure apt to i (HowTos)