[Bug 1582899] Re: in-target: mkinitramfs: failed to determine device for /

[TJ]

After noticing  /var/lib/dpkg/info/live-installer.postinst and seeing it
has the crucial step commented out I think the source of the issue is
now identified.

live-installer debian/live-installer.postinst:

waypoint 1  check_target
waypoint 1  get_mirror_info
waypoint 100    install_live_system
waypoint 1  pre_install_hooks
#waypoint 1 setup_dev
waypoint 1  configure_apt_preferences
waypoint 1  configure_apt
waypoint 3  apt_update
waypoint 5  post_install_hooks
waypoint 1  pick_kernel_if_missing
waypoint 20 install_kernel

The question is, is live-installer in control here, or base-installer?
The syslog messages indicate base-installer but there's no sign of its
postinst script in the running installer.

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Title:
  in-target: mkinitramfs: failed to determine device for /

Status in base-installer package in Ubuntu:
  New
Status in initramfs-tools package in Ubuntu:
  New
Status in live-installer package in Ubuntu:
  New

Bug description:
  Sysadmin reported in #ubuntu (later #ubuntu-kernel) the 16.04 ubuntu-
  server failed due to being unable to configure linux-
  image-4.4.0-21-generic.

  Lots of diagnostics and one SSH remote session later we seem to have
  narrowed it down to the installer.

  The cause of the error message appears to be that the symlink names in
  /dev/disk/by-uuid/  haven't been updated after the partitioning stage
  if there were pre-existing partitions and file-systems on the install
  device, *and* the sysadmin chose to format the existing partitions
  when selecting mountpoints.

  In this case a hardware RAID device presents:

  /dev/sda1 (/boot/)
  /dev/sda2 (swap)
  /dev/sda3 (/)

  From the shell I noticed:

  root at tmpstorage:/# ll /dev/disk/by-uuid/
  total 0
  lrwxrwxrwx 1 root root  10 May 17 19:39 130e4419-4bfd-46d2-87f9-62e5379bf591 -> ../../sda1
  lrwxrwxrwx 1 root root  10 May 17 19:39 127d3fa1-c07c-48e4-9e26-1b926d37625c -> ../../sda3
  lrwxrwxrwx 1 root root  10 May 17 19:39 78b88456-2b0b-4265-9ed2-5db61522d887 -> ../../sda2
  lrwxrwxrwx 1 root root   9 May 17 19:39 2016-04-20-22-45-29-00 -> ../../sr1
  drwxr-xr-x 6 root root 120 May 17 19:39 ..
  drwxr-xr-x 2 root root 120 May 17 19:39 .

  root at tmpstorage:/# blkid /dev/sda*
  /dev/sda: PTUUID="a84e60fd" PTTYPE="dos"
  /dev/sda1: UUID="61365714-8ff7-47a2-8035-8aed9e3191a6" TYPE="ext4" PARTUUID="a84e60fd-01"
  /dev/sda2: UUID="78b88456-2b0b-4265-9ed2-5db61522d887" TYPE="swap" PARTUUID="a84e60fd-02"
  /dev/sda3: UUID="75f68451-9472-47c7-9efc-ed032bfa9987" TYPE="ext4" PARTUUID="a84e60fd-03"

  More details to follow.

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