I used 'live' systems to detect the issue, and am not sure how the lp
script is to be used to test, so I've done the following

On hp dx6120mt (mini-tower, pentium 4 dual core, 3gb, winfast clone of
nvidia 7600gt) using a Lubuntu 19.04 x86/i686 system

- fully upgraded 19.04 system, no updates appear
+ run lp 1842382 shell script (output copied to text files)
- added -proposed; `sudo apt update` now finds 31 packages
- apt full-upgrade; 5.0.0.31 kernel added; reboot
- booted to 5.0.0.31 kernel
+ re-run lp 1842382 shell script (output copied to text files)

The combined notes are attached (I won't upload the .pre & .post text
files as content is combined in uploaded file) for someone to evaluate.

If you need it performed on amd64, please let me know.
(I had a i686 test-box with 19.04 installed in the room)

** Attachment added: "notes & copy/pastes as I performed steps."
   
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1842382/+attachment/5293376/+files/lp_1842382_script-run_dx6120.txt

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https://bugs.launchpad.net/bugs/1842382

Title:
  /proc/self/maps paths missing on live session (was vlc won't start;
  eoan 19.10 & bionic 18.04 ubuntu/lubuntu/kubuntu/xubuntu/ubuntu-mate
  dailies)

Status in linux package in Ubuntu:
  Fix Committed
Status in linux source package in Disco:
  Fix Committed
Status in linux source package in Eoan:
  Fix Committed

Bug description:
  SRU Justification

  Impact: A patch to enable mounting overlayfs over shiftfs introduced a
  regression in /proc/pid/maps when a proc mount over an overlayfs mount
  is accessed from within a chroot. All paths within the file are /
  instead of paths to the files backing memory-mapped regions. This is
  causing issues in several different configurations.

  Fix: Revert the offending patch.

  Test Case: A simple reproducer can be found attached in lp1842382.sh.

  Regression Potential: This reverts to the previous behavior. Mounting
  overlayfs over shiftfs will not work until a fixed patch is applied.

  ---

  Using Lubuntu 19.10 daily 'live' :   (later confirmed with 
Ubuntu/kubuntu/xubuntu too if `vlc` is added if not already present)
  From menu option, from pcmanfm-qt (trying to open an appropriate file), or 
from terminal I've been unable to start vlc.

  lubuntu@lubuntu:~$ vlc
  VLC media player 3.0.8 Vetinari (revision 3.0.8-0-gf350b6b5a7)
  lubuntu@lubuntu:~$

  No crash reports are visible (/var/crash/ is empty) and I see no
  reason, but I cannot get vlc to play files, or open.  I'll continue to
  explore as I'm able.

  QA-test on lenovo thinkpad x201 (i5-m520, 4gb, i915)

  ProblemType: Bug
  DistroRelease: Ubuntu 19.10
  Package: vlc 3.0.8-2
  ProcVersionSignature: Ubuntu 5.2.0-15.16-generic 5.2.9
  Uname: Linux 5.2.0-15-generic x86_64
  ApportVersion: 2.20.11-0ubuntu7
  Architecture: amd64
  CasperVersion: 1.415
  CurrentDesktop: LXQt
  Date: Tue Sep  3 06:03:17 2019
  LiveMediaBuild: Lubuntu 19.10 "Eoan Ermine" - Alpha amd64 (20190902)
  SourcePackage: vlc
  UpgradeStatus: No upgrade log present (probably fresh install)

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