I've downloaded Ubuntu Desktop Live media and was unable to preseed installation changing boot args to:
boot=casper initrd=/casper/initrd.gz net.ifnames=0 auto-install/enable=true debconf/priority=critical interface=auto preseed/url=http://10.0.0.2/ubuntu-16.04/preseed.cfg
Live CD booted and downloaded preseed file, but keeps asking all questions for installation.
Best Answer
It old, but it may worth consider... Try using alternate ISO, it says here (https://serverfault.com/questions/143296/how-to-get-http-preseed-to-work-correctly-on-ubuntu-10-04-lts-lucid) that preseed don't work with desktop iso
I succeed with server ISO with this boot line : ESC + F6 + ESC, then edit boot line with :
Edit : Work better with what in bold
install auto=true priority=critical url=http://IP/path/to/file/filename initrd=/install/initrd.gz quiet ---
The reason why preseed appear to not working with Desktop ISO seems related to ubuntu installer which for desktop is now Ubiquity
Ref.: Preseeding does not work properly in Ubuntu 14.04
Ubiquity links: https://wiki.ubuntu.com/Ubiquity https://wiki.ubuntu.com/UbiquityAutomation
So you may search about that to figure out how to preseed Desktop ISO properly.