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[Launchpad Bug Tracker <1531928@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package initramfs-tools - 0.122ubuntu1

---------------
initramfs-tools (0.122ubuntu1) xenial; urgency=medium

  * Merge with Debian v0.122, known to fix:
    - root=PARTUUID=<partuuid> is not recognized as valid syntax
      (LP: #1531928)
  * Merge with Debian v0.122 (LP: #1541508), remaining changes:
    - Set takeover=1 in update-initramfs.
    - Drop hooks/keymap and associated code; console-setup takes care of
      this in Ubuntu.
    - Add a new 'fixrtc' script that tries to set the system clock forward
      based on the last mount time of the root disk; without this kludge,
      systems without a working RTC will end up in a perpetual reboot loop.
    - Set hostname at boot, for the benefit of mdadm autoassembly.
    - Don't display "Loading, please wait..." message when 'quiet' is in
      /proc/cmdline.
    - Ignore errors from iscan and iscan-data hooks.
    - Allow scripts and hooks to specify OPTION=VAR, and unless VAR is set
      to something other than "n", the script will not be included.
    - Restore the framebuffer hook and script, copying KMS and other
      framebuffer drivers into the initramfs, but make them optional; you
      need to set FRAMEBUFFER=y for these to be included.
    - Add hwaddr= alias for BOOTIF= for compatibility.
    - When receiving "recovery" on cmdline, start upstart with --startup-
      event=recovery (LP: #575469)
    - Make /etc/mtab a symlink to /proc/mounts on startup, since e.g.
      current ntfs-3g doesn't work otherwise.
    - Mount /dev with the default tmpfs size rather than sourcing udev.conf.
    - Automatically blacklist vga16fb when vga= or video= specified on
      kernel command-line.
    - Add Hyper-V paravirtualised device drivers to the initramfs to allow
      booting of stock images in a Hyper-V guest. (LP: #917135)
    - Add mountroot failure support, to allow meaningful messages when no
      root device can be found.
    - Retain netboot= compatibility option.
    - Breaks: mountall (<< 2.0~)
    - Retain cryptopts= compatibility option.
    - Use busybox-initramfs for Depends.
    - Add vfat modules to the initramfs.
    - Maintain compatibility with pre- /run configurations
    - Use gzip from busybox instead of klibc.  Depend on busybox-initramfs
      (>= 1:1.13.3-1ubuntu5) to ensure that we have it.
    - Sync the mount options for /run from /lib/init/fstab (LP: #1152744)
    - Increase rootdelay to 180s on powerpc/ppc64/ppc64el (LP: #1326199)
    - fixrtc: wait for udev to settle to expose device symlinks
    - fixrtc: handle hwclock -s failures safely
    - fixrtc: support busybox, handle last mount time on system partition,
      expose fs create time (LP: #1420473)
    - fixrtc: avoid using xargs, wait-for-root before examining
    - fixrtc: suppress /dev/ram as a root when using systempart (LP:
      #1443329)
    - ppc64el: enable PowerPC NX Crypto Coprocessor
    - resume: only resume when the partition contains a resume image
    - resume: announce resume via plymouth if available
    - Don't load keymaps unless we're loading a framebuffer; but set the
      keymap before giving a root shell.
    - Add new initramfs-tools-bin package containing a binary that uses
      libudev to wait for udev to create the udev device, or wait for udev
      to finish processing if we catch it in the act, and returns the
      filesystem type as already probed by udev.
    - Incorporate rzscontrol from compcache so that we can control current
      ramzswap devices.
    - Support loading compcache from the initramfs.
    - debian/control: update Vcs-* links for Ubuntu.
    - hook-functions: fix PowerPC NX Crypto Coprocessor support (LP:
      #1454687)
    - Drop: Maintain compatibility with pre- /run configurations (LP:
      #1485752)
    - Drop: Ignore errors from iscan and iscan-data hooks (LP: #1485562)
    - init: Mount /dev with "nosuid" Thanks to Daniel (LP: #1450960)
    - import direct archive upload 0.120ubuntu6
    - add squashfs to list of 'most' modules (LP: #1501834)
    - drop Breaks: against upstart as we use it in user sessions.
    - support mounting of loopback devices via loop*= parameters
    - local_device_setup: use wait-for-root if it supports the device
      alias type

 -- Andy Whitcroft <apw@xxxxxxxxxx>  Mon, 25 Jan 2016 16:08:12 +0000

** Changed in: initramfs-tools (Ubuntu)
       Status: In Progress => Fix Released

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https://bugs.launchpad.net/bugs/1531928

Title:
  [Xenial] root=PARTUUID=<partuuid>  is not recognized as valid syntax.

Status in initramfs-tools package in Ubuntu:
  Fix Released

Bug description:
  As per kernel source init/do_mounts.c root=PARTUUID=<partuuid> is acceptable format to pass root= option on command line to boot a system. But due to a bug in initramfs-tools this syntax does not work 
  https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=801154

  /*
   *      Convert a name into device number.  We accept the following variants:
   *
   *      1) <hex_major><hex_minor> device number in hexadecimal represents itself
   *         no leading 0x, for example b302.
   *      2) /dev/nfs represents Root_NFS (0xff)
   *      3) /dev/<disk_name> represents the device number of disk
   *      4) /dev/<disk_name><decimal> represents the device number
   *         of partition - device number of disk plus the partition number
   *      5) /dev/<disk_name>p<decimal> - same as the above, that form is
   *         used when disk name of partitioned disk ends on a digit.
   *      6) PARTUUID=00112233-4455-6677-8899-AABBCCDDEEFF representing the
   *         unique id of a partition if the partition table provides it.
   *         The UUID may be either an EFI/GPT UUID, or refer to an MSDOS
   *         partition using the format SSSSSSSS-PP, where SSSSSSSS is a zero-
   *         filled hex representation of the 32-bit "NT disk signature", and PP
   *         is a zero-filled hex representation of the 1-based partition number.
   *      7) PARTUUID=<UUID>/PARTNROFF=<int> to select a partition in relation to
   *         a partition with a known unique id.
   *      8) <major>:<minor> major and minor number of the device separated by
   *         a colon.
   *

  Please merge the patch from debian in xenial to support PARTUUID in
  initramfs.

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