I downloaded official ubuntu 12.04.5 LTS (64bit) ISO file and using my desktop Ubuntu (latest 14.10) and Startup Disk Creator I created bootable USB installation media. It all worked fine installing 12.04.5 on target system which is ACER TravelMate B115 set in UEFI Boot Mode and with Secure Boot Disable.
But my intension is to create my own pressed file for custom auto installation. In this forum I found question How to create UEFI-only bootable media. I followed instructions and I created UEFI bootable media. Very simple (copy all files from ISO image using 7z program as suggested directly to FAT32 formatted USB). At this point I have not changed any preseed file (or any other file from ISO image - stright copy). I plugged in USB key into ACER, rebooted it and I was able to select USB HDD boot from BIOS boot option menu. From GRUB menu I selected the 1st memu item - Intstall Ubuntu. So far so good. In usual installation dialogs I selected language, location, country keyboard, keyboard layout. Installation proceeded to detect hardware etc and then message is displayed in message box titled: [!!] Load installer component from CD
There was a problem reading form the CD-ROM. Please make sure it is in the drive. If retrying does not work you should check the integrity of your CD-ROM. Failed to copy file from CD-ROM. Retry?
I repeated USB disk creation and I had same failure. What am I doing wrong? Help!