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

[Akeo]

Completed my testing on the 3 UEFI machines I have that were displaying
the symptoms before (2 intel NUCs and one ASUS based UEFI PCs, ranging
from 2-cores to 6-cores, and ranging from 2010 to 2020), and I am happy
to report that, no matter how many times I boot the system, the 'casper-
rw' labelled persistent partition always appears to mount properly.

I have also not seen that "ln: /tmp/mountroot-fail-hooks.d/scripts/init-
premount/lvm2: No such file or directory" error manifest itself again,
so I am hoping this was just a fluke.

I have however seen the "access beyond end of device" and "I/O error
while writing superblock" errors every single time during
powerdown/reboot, so I have created
https://bugs.launchpad.net/ubuntu/+source/casper/+bug/1871454 for this
issue.

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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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