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  gnome-disks truncates a huge image when restoring to a drive from xz-
  compressed image file

Status in gnome-disk-utility package in Ubuntu:

Bug description:
  This bug affects Lubuntu Xenial i386 but not amd64.

  gnome-disks works when restoring from a 300 MB image compressed with
  xz. But it fails when trying to 'restore' from a 12 GB image
  compressed with xz. This extraction works with mkusb, which uses xzcat
  and dd under the hood. The process is described at


  and the file to 'restore' is


  gnome-disks 'thinks' that the file size is 3.5 GB, so it truncates it,
  and the result is a corrupted system on the target drive. See the
  attached screenshot.

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: gnome-disk-utility
  ProcVersionSignature: Ubuntu 4.4.0-18.34-generic 4.4.6
  Uname: Linux 4.4.0-18-generic i686
  ApportVersion: 2.20.1-0ubuntu2
  Architecture: i386
  CasperVersion: 1.372
  CurrentDesktop: LXDE
  Date: Sat Apr 16 21:26:16 2016
  LiveMediaBuild: Lubuntu 16.04 LTS "Xenial Xerus" - Beta i386 (20160415)
   PATH=(custom, no user)
  SourcePackage: gnome-disk-utility
  UpgradeStatus: No upgrade log present (probably fresh install)

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