I'm trying to install 12.04 amd64, but none of the options work. When the cd runs, the options to run,install,and check disk for defects give the following error: "/casper/vmlinuz: file not found". I've already checked the iso with md5sum. Any help would be greatly appreciated.
Simply delete the .efi extension. Worked for me!
For me I was installing Ubuntu Studio 17 on an older laptop and saw the error. What fixed it for me was to monitor the reboot and as SOON as I saw the select language area I pressed enter and then also selected the correct menu item to install the OS on the laptop. In my case it appears that the error was from the CD rom pausing and this causes the file read error. But if cd is still spinning, all is well.