[Bug 1605803] Re: usb-creator in Xenial fails to write customized ubuntu iso files

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https://bugs.launchpad.net/bugs/1605803

Title:
  usb-creator in Xenial fails to write customized ubuntu iso files

Status in usb-creator package in Ubuntu:
  New

Bug description:
  Hi,

  I am one of the developers of OSGeoLive, an 8 year old project, which
  is a Geospatial distribution based on Lubuntu (previously on Xubuntu).

  The last years we have been using the official customization guide to build our spin off iso files:
  https://help.ubuntu.com/community/LiveCDCustomization

  We are now in the process of releasing our version 10.0 (based on
  Xenial) and during our release candidate stage, we noticed that our
  4GB iso files fail to be turned into a live usb using the usb-creator
  version (0.3.2) included in Ubuntu 16.04.

  After building a live usb key with usb-creator 0.3.2 and try to boot from the usb, we are getting an "operating system missing" error.
  We noticed that usb-creator was upgraded for Xenial, so we tried instead to use previous versions of usb-creator to create a live usb, and both Wily and Trusty versions worked. With those older versions, there was an issue with syslinux not being the same version as the one used in the iso, which we fixed as mentioned here:
  http://askubuntu.com/questions/486602/ubuntu-14-04-lts-live-usb-boot-error-gfxboot-c32not-a-valid-com32r-image/543284#543284

  We are wondering if this is a bug or it is related with some kind of
  bootloader change that happened in Xenial, that we are not aware of.

  Steps to reproduce:
  1. Download our rc1 iso file from:
  http://aiolos.survey.ntua.gr/gisvm/10.0/osgeo-live-10.0rc1-amd64.iso
  or
  http://osprey.ucdavis.edu/downloads/osgeo/gisvm/gisvm/10.0rc1/osgeo-live-10.0rc1-amd64.iso

  2. Burn the iso into an 8GB usb key in Ubuntu Xenial

  3. Boot from the new usb key.

  
  Any help would be much appreciated.
  Best regards,
  Angelos

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