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

[Michael Hudson-Doyle]

First of all, I'm sorry I appear to have been neglecting this bug. It's
hard to debug something you can't see! And I've had lots of other things
on my plate unfortunately.

I don't think anyone can claim with a straight face that casper-rw is
anything other than opaque. We could have an argument about whether
'writable' is better or not but that's not very interesting.

And, well, I still can't reproduce this. I have tried, several times, on
real hardware. It's a bit harder to test on hw currently because my
usual test machine is in an office I can't travel to thanks to the
COVID-19 lockdown, but I tried your instructions and booted the
resulting disk on my machine and it still mounted the casper-rw
partition.

So let's try something else. I've uploaded a hacked up initrd to
https://people.canonical.com/~mwh/casper-initrd.gz. If you can drop this
over the one that came on the ISO and boot there should be two files
present: /run/udev-ls.txt and /run/udev-dbg.txt. Can you boot a failing
system and attach the files to the bug? udev-dbg.txt will be a few
hundred kilobytes, the other one will be small.

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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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