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[Brad Figg <brad.figg@xxxxxxxxxxxxx>]

This bug is missing log files that will aid in diagnosing the problem.
>From a terminal window please run:

apport-collect 1574178

and then change the status of the bug to 'Confirmed'.

If, due to the nature of the issue you have encountered, you are unable
to run this command, please add a comment stating that fact and change
the bug status to 'Confirmed'.

This change has been made by an automated script, maintained by the
Ubuntu Kernel Team.

** Changed in: linux (Ubuntu)
       Status: New => Incomplete

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https://bugs.launchpad.net/bugs/1574178

Title:
  4.4.0-21 "gave up waiting for root device"

Status in linux package in Ubuntu:
  Incomplete

Bug description:
  On a Lenovo A740, after upgrading to Xenial I have to downgrade to
  kernel 4.2.0-35 in order to be able to boot at all.

  
  My current /etc/default/grub:

  # If you change this file, run 'update-grub' afterwards to update
  # /boot/grub/grub.cfg.
  # For full documentation of the options in this file, see:
  #   info -f grub -n 'Simple configuration'

  #GRUB_DEFAULT=0
  #KBU: 4.4.0 doesn't find root :(((
  GRUB_DEFAULT="Advanced options for Ubuntu>Ubuntu, with Linux 4.2.0-35-generic"
  #GRUB_HIDDEN_TIMEOUT=0
  GRUB_HIDDEN_TIMEOUT_QUIET=true
  GRUB_TIMEOUT=5
  GRUB_DISTRIBUTOR=`lsb_release -i -s 2> /dev/null || echo Debian`
  #GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"
  GRUB_CMDLINE_LINUX_DEFAULT=""
  GRUB_CMDLINE_LINUX="noprompt persistent"

  # Uncomment to enable BadRAM filtering, modify to suit your needs
  # This works with Linux (no patch required) and with any kernel that obtains
  # the memory map information from GRUB (GNU Mach, kernel of FreeBSD ...)
  #GRUB_BADRAM="0x01234567,0xfefefefe,0x89abcdef,0xefefefef"

  # Uncomment to disable graphical terminal (grub-pc only)
  #GRUB_TERMINAL=console

  # The resolution used on graphical terminal
  # note that you can use only modes which your graphic card supports via VBE
  # you can see them in real GRUB with the command `vbeinfo'
  #GRUB_GFXMODE=640x480

  # Uncomment if you don't want GRUB to pass "root=UUID=xxx" parameter to Linux
  #GRUB_DISABLE_LINUX_UUID=true

  # Uncomment to disable generation of recovery mode menu entries
  #GRUB_DISABLE_RECOVERY="true"

  # Uncomment to get a beep at grub start
  #GRUB_INIT_TUNE="480 440 1"



  This is the same system as
  https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1463422

  See attached image for what the screen looks like when trying to boot
  4.4. My USB keyboard also stops working there so I can't actually type
  anything into the busybox.

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