[Bug 1840122] Missing required logs.

[Ubuntu Kernel Bot]

This bug is missing log files that will aid in diagnosing the problem.
While running an Ubuntu kernel (not a mainline or third-party kernel)
please enter the following command in a terminal window:

apport-collect 1840122

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/1840122

Title:
  System fails to reboot from live session or ubiquity-dm

Status in casper package in Ubuntu:
  Confirmed
Status in linux package in Ubuntu:
  Incomplete

Bug description:
  Last known good image: Eoan Ubuntu Desktop 20190715

  Test Case:
  1. Boot eoan desktop to a live session
  2. Wait a couple of minutes until snapd settles
  3. Reboot the system from the system menu or from the command line

  Expected result:
  The system reboots

  Actual result:
  The systems fails to reboot or shutdown and displays some errors about failing to unmount /cdrom and squashfs errors in a loop.

  Unmounting /cdrom...
  [FAILED] Failed unmounting /cdrom.
  [  OK  ] Started Shuts down the "li…" preinstalled system cleanly.
  [  OK  ] Reached target Final Step.
  [  OK  ] Started Reboot.
  [  OK  ] Reached target Reboot.
  [  115.744188] print_req_error: I/O error, dev sr0, sector 1508872 flags 80700
  [  115.768139] print_req_error: I/O error, dev sr0, sector 1508872 flags 0
  [  115.771469] print_req_error: I/O error, dev loop0, sector 1501550 flags 0
  [  115.775824] SQUASHFS error: squashfs_read_data failed to read block 0x2dd2d998

  This also causes daily tests to fail.

  ProblemType: Bug
  DistroRelease: Ubuntu 19.10
  Package: casper 1.414
  ProcVersionSignature: Ubuntu 5.2.0-10.11-generic 5.2.4
  Uname: Linux 5.2.0-10-generic x86_64
  ApportVersion: 2.20.11-0ubuntu7
  Architecture: amd64
  CasperVersion: 1.414
  CurrentDesktop: ubuntu:GNOME
  Date: Wed Aug 14 08:31:30 2019
  LiveMediaBuild: Ubuntu 19.10 "Eoan Ermine" - Alpha amd64 (20190813)
  ProcEnviron:
   TERM=xterm-256color
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=C.UTF-8
   SHELL=/bin/bash
  SourcePackage: casper
  UpgradeStatus: No upgrade log present (probably fresh install)

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