[Bug 1734430] Re: isodevice unable to unmount when using loopback

[Marcin]

*** This bug is a duplicate of bug 684280 ***
    https://bugs.launchpad.net/bugs/684280

** This bug has been marked a duplicate of bug 684280
   casper toram forgets to disconnect loop device

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https://bugs.launchpad.net/bugs/1734430

Title:
  isodevice unable to unmount when using loopback

Status in ubiquity package in Ubuntu:
  Confirmed

Bug description:
  Using these stanzas to boot various iso's. Find that in bionic
  isodevice remains mounted (and if I try to manually do so - the device
  tells me it's busy)

  Tested 17.10,17.04,16.04 - all work as expected.

  menuentry "Xubuntu 18.04 Daily ISO" {
          set isofile="/boot/grubiso/bionic-desktop-amd64.iso"
          # or set isofile="/<username>/Downloads/ubuntu-12.04.2-desktop-amd64.iso"
          # if you use a single partition for your $HOME
          loopback loop (hd0,6)$isofile
          linux (loop)/casper/vmlinuz.efi boot=casper toram maybe-ubiquity iso-scan/filename=$isofile noprompt noswap noeject
          initrd (loop)/casper/initrd.lz
  }

  menuentry "Xubuntu Xenial" {
          set isofile="/boot/grubiso/xenial-desktop-amd64.iso"
          # or set isofile="/<username>/Downloads/ubuntu-12.04.2-desktop-amd64.iso"
          # if you use a single partition for your $HOME
          loopback loop (hd0,6)$isofile
          linux (loop)/casper/vmlinuz.efi boot=casper toram maybe-ubiquity iso-scan/filename=$isofile noprompt noswap noeject
          initrd (loop)/casper/initrd.lz
  }

  menuentry "Xubuntu Zesty" {
          set isofile="/boot/grubiso/zesty-desktop-amd64.iso"
          # or set isofile="/<username>/Downloads/ubuntu-12.04.2-desktop-amd64.iso"
          # if you use a single partition for your $HOME
          loopback loop (hd0,6)$isofile
          linux (loop)/casper/vmlinuz.efi boot=casper toram maybe-ubiquity iso-scan/filename=$isofile noprompt noswap noeject
          initrd (loop)/casper/initrd.lz
  }

  menuentry "Xubuntu Artful" {
          set isofile="/boot/grubiso/artful-desktop-amd64.iso"
          # or set isofile="/<username>/Downloads/ubuntu-12.04.2-desktop-amd64.iso"
          # if you use a single partition for your $HOME
          loopback loop (hd0,6)$isofile
          linux (loop)/casper/vmlinuz.efi boot=casper toram maybe-ubiquity iso-scan/filename=$isofile noprompt noswap noeject
          initrd (loop)/casper/initrd.lz
  }

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: ubiquity (not installed)
  ProcVersionSignature: Ubuntu 4.13.0-17.20-generic 4.13.8
  Uname: Linux 4.13.0-17-generic x86_64
  ApportVersion: 2.20.8-0ubuntu2
  Architecture: amd64
  CurrentDesktop: XFCE
  Date: Sat Nov 25 09:17:23 2017
  InstallationDate: Installed on 2017-09-02 (84 days ago)
  InstallationMedia: Xubuntu 17.10 "Artful Aardvark" - Alpha amd64 (20170902)
  SourcePackage: ubiquity
  UpgradeStatus: No upgrade log present (probably fresh install)

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