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[Manoj Iyer <1531928@xxxxxxxxxxxxxxxxxx>]

I have tested the initramfs-tools in ppa:apw/ubuntu/initramfs-tools and
I can report that boot with root=PARTUUID=<partuuid> works.

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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:
  In Progress

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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