[Bug 1863672] Re: The 'new' persistent live method starting in 19.10 no longer works

[Akeo]

Thanks Michael.

As you know, I would strongly favour reverting the problematic changes
so that everybody has more time to analyse where the issue lies (and
especially why some machines don't seem to be affected), but I think I
made my position clear already so I'll leave you and the release team
decide what you think is best at this stage.

With regards to the updated initrd, this one seems to work much better,
so I have attached the files I get. This test was performed on a very
recent Intel NUC 10i7FNK where the persistent partition failed to mount.
As you will see, nothing got written to udev-ls.txt, but hopefully you
can get enough data from the other file.

If you need more data, please let me know.

** Attachment added: "udev-files-nuc10i7-20200406.zip"
   https://bugs.launchpad.net/ubuntu/+source/casper/+bug/1863672/+attachment/5348021/+files/udev-files-nuc10i7-20200406.zip

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https://bugs.launchpad.net/bugs/1863672

Title:
  The 'new' persistent live method starting in 19.10 no longer works

Status in casper package in Ubuntu:
  Confirmed

Bug description:
  I am iso-testing Focal Fossa and I am creating and maintaining tools
  to create live and persistent live USB drives. Lubuntu Focal daily
  live dated 2020-02-12 works. But the current version of Lubuntu Focal
  dated 2020-02-16 (zsynced approx. one hour ago) does not work when
  using exactly the same method using mkusb-plug, that edits the iso
  file to replace 'quiet splash' with 'persistent  ' /12 characters/ and
  creating an ext partition behind it.

  I noticed that the version of casper has changed from 1.438build1
  (when it worked) to 1.439 so I suspect that this has caused the
  failure.

  ProblemType: Bug
  DistroRelease: Ubuntu 20.04
  Package: casper 1.439
  ProcVersionSignature: Ubuntu 5.4.0-14.17-generic 5.4.18
  Uname: Linux 5.4.0-14-generic x86_64
  ApportVersion: 2.20.11-0ubuntu16
  Architecture: amd64
  CasperVersion: 1.439
  CurrentDesktop: LXQt
  Date: Mon Feb 17 20:54:54 2020
  LiveMediaBuild: Lubuntu 20.04 LTS "Focal Fossa" - Alpha amd64 (20200216)
  SourcePackage: casper
  UpgradeStatus: No upgrade log present (probably fresh install)
  mtime.conffile..etc.casper.conf: 2020-02-17T20:52:45.667205

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