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[Mark Rogers <1463120@xxxxxxxxxxxxxxxxxx>]

Latest kernel (4.10-040100rc2-generic):
Reaches "Ubuntu 15.04" splash screen (with the four dots) which the previous kernel didn't, but still fails to boot, eventually dropping me into emergency mode shell as before.

Removing the offending fstab line and continuing to boot (Ctrl-D from shell) returns me to the splash screen for a while before returning me to emergency shell. The error immediately preceding this (which has been present on previous occasions on other kernels too) is:
Error getting authority: Error initializing authority: Could not connect: No such file or directory (g-io-error-quark, 1)

(Error transcribed from VBox screen not copy+pasted, I've tried to get
it 100% correct.)

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https://bugs.launchpad.net/bugs/1463120

Title:
  Failure to boot if fstab disk mounts fail

Status in linux package in Ubuntu:
  Incomplete

Bug description:
  I found this on my main 15.04 desktop but have reproduced it in a VM:
  1. Install Ubuntu 15.04 (I included updates and non-free but I doubt that matters).
  2. Add a bogus entry to /etc/fstab, eg:
    /dev/sdd1 /mnt/sdd1 ext4 errors=remount-ro 0 0
  Note that /mnd/sdd1 exists but /dev/sdd1 does not
  3. Reboot

  Expected: Failure to mount /dev/sdd1 reported and option to boot without mounting it
  Actual: System appears to hang, although it will eventually present a root terminal (with no indication of the cause of the problem). It appears to hang prior to switching graphical mode, with the result that any warnings/errors that are present on all boots but invisible because the screen clears before they're seen become visible for the first time incorrectly suggesting they are the cause of the problem.

  Removing (or commenting out) the problematic entries and rebooting
  allows the system to boot.

  HOWEVER: The grub boot menu now appears and any pre-existing menu
  timeout and default action seems to have been lost; it's now necessary
  to select a boot option on each boot. This may be a separate bug (or
  feature?).

  My actual case: I have external drives permanently connected via USB, however the USB card appears to have failed hence the drives are not accessible. With no clues (and being unfamiliar to systemd) working out why the system wouldn't boot was a tough job.
  --- 
  ApportVersion: 2.17.2-0ubuntu1.1
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  mark       1382 F.... pulseaudio
  DistroRelease: Ubuntu 15.04
  HibernationDevice: RESUME=UUID=76b7b79b-0cdd-4605-bc58-381fad8fa67f
  InstallationDate: Installed on 2015-06-08 (4 days ago)
  InstallationMedia: Ubuntu 15.04 "Vivid Vervet" - Release amd64 (20150422)
  IwConfig:
   eth0      no wireless extensions.
   
   lo        no wireless extensions.
  Lsusb:
   Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
   Bus 002 Device 002: ID 80ee:0021 VirtualBox USB Tablet
   Bus 002 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
  MachineType: innotek GmbH VirtualBox
  Package: linux (not installed)
  ProcEnviron:
   LANGUAGE=en_GB:en
   TERM=xterm
   PATH=(custom, no user)
   LANG=en_GB.UTF-8
   SHELL=/bin/bash
  ProcFB:
   
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.19.0-20-generic root=UUID=53f2fcea-e84c-4736-ac69-f34305a63432 ro quiet splash
  ProcVersionSignature: Ubuntu 3.19.0-20.20-generic 3.19.8
  PulseList:
   Error: command ['pacmd', 'list'] failed with exit code 1: Home directory not accessible: Permission denied
   No PulseAudio daemon running, or not running as session daemon.
  RelatedPackageVersions:
   linux-restricted-modules-3.19.0-20-generic N/A
   linux-backports-modules-3.19.0-20-generic  N/A
   linux-firmware                             1.143.1
  RfKill:
   
  Tags:  vivid
  UdevLog: Error: [Errno 2] No such file or directory: '/var/log/udev'
  Uname: Linux 3.19.0-20-generic x86_64
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups:
   
  _MarkForUpload: True
  dmi.bios.date: 12/01/2006
  dmi.bios.vendor: innotek GmbH
  dmi.bios.version: VirtualBox
  dmi.board.name: VirtualBox
  dmi.board.vendor: Oracle Corporation
  dmi.board.version: 1.2
  dmi.chassis.type: 1
  dmi.chassis.vendor: Oracle Corporation
  dmi.modalias: dmi:bvninnotekGmbH:bvrVirtualBox:bd12/01/2006:svninnotekGmbH:pnVirtualBox:pvr1.2:rvnOracleCorporation:rnVirtualBox:rvr1.2:cvnOracleCorporation:ct1:cvr:
  dmi.product.name: VirtualBox
  dmi.product.version: 1.2
  dmi.sys.vendor: innotek GmbH

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