Why the Ubuntu Server installer always require the CD-ROM detection to continue 
installation?
In other OSes such as SUSE, CentOS, Fedora, ... I can install without the need 
of CD-ROM. Just dd-ing the ISO file into a USB key drive and use it for 
installation.

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https://bugs.launchpad.net/bugs/1638779

Title:
  [arm] Missing AHCI driver in Ubuntu Xenial Installer for ARM

Status in linux package in Ubuntu:
  Confirmed

Bug description:
  Download the media installation ISO file at 
https://www.ubuntu.com/download/server/arm and burn it to a CD-ROM. Then, put 
it into the SATA CD drive to install Ubuntu into Mustang/Merlin boards (XGene 
platform), the Installer does not detect the CD-ROM so it report a dialog with 
below content:
  "Your installation CD-ROM couldn't be mounted. This probably means that the 
CD-ROM was not in the drive. If so you can insert it and try again. Retry 
mounting the CD-ROM?".
  Investigate more on the installer media, I found that the AHCI driver is not 
enabled.
  Below steps I have done to check:
  - Mount ISO file and copy initrd.gz:
   # mkdir mnt
   # mount -o loop ubuntu-16.04.1-server-arm64.iso ./mnt
   # cp ./mnt/install/initrd.gz .
  - Extract initrd.gz:
   # gunzip initrd.gz
   # cpio -id < initrd
  - List the drivers/ata folder
   # ls lib/modules/4.4.0-31-generic/kernel/drivers
  block  gpio  gpu  hid  i2c  input  media  mfd  power  regulator  rtc  usb  
video
  No lib/modules/4.4.0-31-generic/kernel/drivers/ata folder exist.

  Try to check with x86 installer media:
   # ls lib/modules/4.4.0-31-generic/kernel/drivers/
  ata  block  char  firewire  gpio  gpu  hid  hv  i2c  infiniband  input  media 
 mfd  net  parport  pcmcia  power  regulator  rtc  scsi  tty  usb  video
   # lib/modules/4.4.0-31-generic/kernel/drivers/ata/ | grep ahci
  acard-ahci.ko
  ahci.ko
  ahci_platform.ko
  libahci.ko
  libahci_platform.ko

  Can you help to add AHCI support for Ubuntu ARM Media installer?

  Thanks,
  Thang Q. Nguyen

  PS: I submitted bug at
  https://bugs.launchpad.net/santacruz/+bug/1632559 but Thad asked to
  report here.

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