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[Erick Brunzell <lbsolost@xxxxxxxxx>]

"I'm leaning towards this" ..................... "this" being the
ability to mount optical discs with existing data.

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https://bugs.launchpad.net/bugs/1537918

Title:
  Kernel doesn't support UDF

Status in linux package in Ubuntu:
  Confirmed

Bug description:
  I was pulling my hair out for the last six months trying to figure out
  why the heck some DVDs (encrypted, pressed, burned, it doesn't matter)
  just will not be recognized. In the GNOME Disk Utility, the disks show
  up as X.X GB Unknown, and will not mount. I have to manually go into a
  terminal, type

  sudo mount /dev/sr0 /mnt

  and just deal with it. This is a real pain, and I just recently
  figured out why. According to this:

  http://superuser.com/questions/730130/how-to-get-ubuntu-12-04-to-
  recognize-the-udf-filesystem

  in addition to this:

  http://www.linuxquestions.org/questions/linux-desktop-74/some-udf-
  dvds-will-not-mount-unknown-filesystem-4175550577/

  I deduced that the kernel was not compiled with UDF support.

  ProblemType: Bug
  DistroRelease: Ubuntu 15.10
  Package: linux-image-4.2.0-22-generic 4.2.0-22.27
  ProcVersionSignature: Ubuntu 4.2.0-22.27-generic 4.2.6
  Uname: Linux 4.2.0-22-generic x86_64
  NonfreeKernelModules: wl
  ApportVersion: 2.19.1-0ubuntu5
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  ihatewindows  28002 F.... pulseaudio
  CurrentDesktop: Unity
  Date: Fri Jan 22 13:55:28 2016
  HibernationDevice: RESUME=UUID=2f0f1d7c-4117-40df-9314-f2556c82fc3b
  InstallationDate: Installed on 2015-11-12 (71 days ago)
  InstallationMedia: Ubuntu 15.10 "Wily Werewolf" - Release amd64 (20151021)
  MachineType: Dell Inc. Latitude E5420
  ProcEnviron:
   LANGUAGE=en_US
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.2.0-22-generic root=/dev/mapper/ubuntu--vg-root ro quiet splash vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-4.2.0-22-generic N/A
   linux-backports-modules-4.2.0-22-generic  N/A
   linux-firmware                            1.149.3
  SourcePackage: linux
  UdevLog: Error: [Errno 2] No such file or directory: '/var/log/udev'
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 11/30/2011
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: A05
  dmi.board.name: 0H5TG2
  dmi.board.vendor: Dell Inc.
  dmi.board.version: A03
  dmi.chassis.type: 9
  dmi.chassis.vendor: Dell Inc.
  dmi.modalias: dmi:bvnDellInc.:bvrA05:bd11/30/2011:svnDellInc.:pnLatitudeE5420:pvr01:rvnDellInc.:rn0H5TG2:rvrA03:cvnDellInc.:ct9:cvr:
  dmi.product.name: Latitude E5420
  dmi.product.version: 01
  dmi.sys.vendor: Dell Inc.

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