Kubuntu 16.04.3 Install disk not work, casper/vmlinuz missing

[Sebestyen Zalan Szatai]

Hi
I installed a Ubuntu 16.04 with disk, but its really slow, and im trying to install a Kubuntu 16.04 instead.
I used the grub-s iso boot methode first, but it didnt work because missing casper/vmlinuz. I checked the iso, and only casper/vmlinuz.efi are present.
I mad an (actually several) install dvd, but it just whouldn't boot.
I renamed vmlinuz.efi, to vmlinuz, and it still dont work as disc, but it can boot as isoboot(grub).
When I try to install with isoboot, with renamed vmlinuz the install process starts, but it permanent stops at detecting file system 100%, and dont budge further.

Am I doing something wrong? or the iso isnt good for booting?
Thanks
Zalan