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

[sudodus]

@Michael Hudson-Doyle,

After some more testing I have to add some (maybe confusing, maybe
helpful) information:

A - The bug appears in

1. a Toshiba laptop with an Intel i5 generaton 3 CPU (in BIOS mode and
UEFI mode)

http://www.toshiba.se/laptops/satellite-pro/c850/satellite-pro-c850-19w/

This Toshiba laptop has been my main testing computer for several years.

2. a Dell laptop with an Intel i5 generation 4 CPU (in BIOS mode and
UEFI mode)

https://www.cnet.com/products/dell-latitude-e7240-12-5-core-i5-4310u-8
-gb-ram-128-gb-ssd-english/specs/

3. A Lenovo laptop with an Intel i3 generation 2 CPU (tested only in
UEFI mode)

https://shop.lenovo.com/ISS_Static/ww/wci/products/us/laptop/thinkpad/x-series
/x131e-intel/X131e-Datasheet-Intel.pdf


B - The bug does *not* appear in

1. an HP Probook 6450b laptop with an Intel i5 M520, tested only in BIOS
mode

2. a Lenovo V130-14IKB laptop with an Intel i5 generation 7 CPU (rather
new), tested only in UEFI mode

3. a Dell laptop with an Intel i7 generation 4 CPU (in BIOS mode and
UEFI mode)

https://www.cnet.com/products/dell-precision-mobile-
workstation-m4800-15-6-core-i7-4810mq-8-gb-ram-256-gb-ssd-english/specs/

---

I think that there is some kind of race condition as you suspected
already in comment #4.

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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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