[Bug 1672179] [NEW] Live desktop boots wrong install

[William D Waddington]

Public bug reported:

Apologies, this is a strange one and hard to describe...

Kaby Lake i7, 2 SSDs, windows 10 pro 1607 on NVMe SSD.  UEFI/GPT all
drives.

Ubuntu 16.04.2 _live desktop_ on SATA SSD. By that I mean live "CD"
contents copied to a FAT32 partition.  I use it that way since I use
grub2 to launch other tools in the FAT32 partition in addition to
Ubuntu.  Acronis, for example.

If I boot _the same_ Ubuntu live version on a flash drive, I get the
flash drive's grub menu and select "...try..." what actually boots is
the live desktop on the SSD.  I can tell since the flash drive shows up
as removable and the SSD's partition is mounted as /cdrom.

If I obscure casper on the SSD ( casper->casper_OBSCURED) the flash
drive live desktop gets booted fully.  A persistence file on the SSD
also will get used unless I obscure that.

If the live desktop versions are different, the flash drive desktop gets
booted as expected.

I can also avoid the problem by booting a loop-mounted ISO of the live
desktop on flash, even if it is the same version.

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: ubiquity-casper 1.376.2
ProcVersionSignature: Ubuntu 4.8.0-36.36~16.04.1-generic 4.8.11
Uname: Linux 4.8.0-36-generic x86_64
ApportVersion: 2.20.1-0ubuntu2.5
Architecture: amd64
CasperVersion: 1.376.2
CurrentDesktop: Unity
Date: Sun Mar 12 16:52:09 2017
LiveMediaBuild: Ubuntu 16.04.2 LTS "Xenial Xerus" - Release amd64 (20170215.2)
PackageArchitecture: all
ProcEnviron:
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: casper
UpgradeStatus: No upgrade log present (probably fresh install)

** Affects: casper (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug xenial

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https://bugs.launchpad.net/bugs/1672179

Title:
  Live desktop  boots wrong install

Status in casper package in Ubuntu:
  New

Bug description:
  Apologies, this is a strange one and hard to describe...

  Kaby Lake i7, 2 SSDs, windows 10 pro 1607 on NVMe SSD.  UEFI/GPT all
  drives.

  Ubuntu 16.04.2 _live desktop_ on SATA SSD. By that I mean live "CD"
  contents copied to a FAT32 partition.  I use it that way since I use
  grub2 to launch other tools in the FAT32 partition in addition to
  Ubuntu.  Acronis, for example.

  If I boot _the same_ Ubuntu live version on a flash drive, I get the
  flash drive's grub menu and select "...try..." what actually boots is
  the live desktop on the SSD.  I can tell since the flash drive shows
  up as removable and the SSD's partition is mounted as /cdrom.

  If I obscure casper on the SSD ( casper->casper_OBSCURED) the flash
  drive live desktop gets booted fully.  A persistence file on the SSD
  also will get used unless I obscure that.

  If the live desktop versions are different, the flash drive desktop
  gets booted as expected.

  I can also avoid the problem by booting a loop-mounted ISO of the live
  desktop on flash, even if it is the same version.

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: ubiquity-casper 1.376.2
  ProcVersionSignature: Ubuntu 4.8.0-36.36~16.04.1-generic 4.8.11
  Uname: Linux 4.8.0-36-generic x86_64
  ApportVersion: 2.20.1-0ubuntu2.5
  Architecture: amd64
  CasperVersion: 1.376.2
  CurrentDesktop: Unity
  Date: Sun Mar 12 16:52:09 2017
  LiveMediaBuild: Ubuntu 16.04.2 LTS "Xenial Xerus" - Release amd64 (20170215.2)
  PackageArchitecture: all
  ProcEnviron:
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  SourcePackage: casper
  UpgradeStatus: No upgrade log present (probably fresh install)

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