The apport-collect command does not exist in the installer shell. So, can't run 
the command. Trying to save debug log but Ubuntu just support writing to 
floppy, web and mount folder.
Attachment contains logfile for installing Ubuntu. It just has information 
until right before Ubuntu installer start working.
We stuck at below dialog:
   ┌───────────────────┤ [!!] Detect and mount CD-ROM ├────────────────────┐
   │                                                                       │
   │ 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?                                            │
   │                                                                       │
   │     <Yes>                                                    <No>     │
   │                                                                       │
   └───────────────────────────────────────────────────────────────────────┘


** Attachment added: "Ubuntu installation log"
   
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1638779/+attachment/4771549/+files/cdrom_log.txt

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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:
  Incomplete

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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