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[Norbert <1325801@xxxxxxxxxxxxxxxxxx>]

I got to this issue on Ubuntu 12.04.5 amd64 host and Ubuntu 15.04 beta2
guest.

What I did:
1. I downloaded official Ubuntu 15.04 beta2 iso (MD5SUM e838edda85712d283bd94b34dbb5d6ec)
2. launched "usb-creator-gtk" for creation of LiveUSB, selected ISO and target USB-flash, pressed "Make Startup Disk"
3. LiveUSB was created ("Installation Complete" window)
4. Pressed "Test Disk"
5. Got error message in QEMU window ("gfxboot.c32: not a COM32R image")

If I enter manually "live" I get into other issue with VGA adapter (
"The system is running in low-graphic mode" see bug 1437740 ).

So "usb-creator-gtk" from Ubuntu 12.04.5 Precise Pangolin produces Vivid
Vervet image that is unusable in QEMU/KVM.

Please fix this bug in all LTS versions of Ubuntu - 12.04 and 14.04.

** Tags added: precise

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https://bugs.launchpad.net/bugs/1325801

Title:
  failed to boot from USB disk with error: gfxboot.c32: not a COM32R
  Image boot:

Status in Ubuntu CD image build software:
  In Progress
Status in Ubuntu Kylin:
  Triaged
Status in usb-creator package in Ubuntu:
  Fix Released
Status in usb-creator source package in Lucid:
  Triaged
Status in usb-creator source package in Precise:
  Triaged
Status in usb-creator source package in Trusty:
  Triaged
Status in usb-creator source package in Utopic:
  Fix Committed

Bug description:
  [Impact]
  It is common to use usb-creator to write new USB devices with a version of Ubuntu which will then be used to upgrade or proceed with a new installation. In some cases, when using a specific match of versions of Ubuntu with an incompatible syslinux, the resulting USB device will show errors and not display the splash menu to use to select between Live and Install mode, or enabling extra options.
  This patch fixes this incompatibility by always using the syslinux version provided on the ISO image being used to write the USB device; which would always be compatible with the system to install if it's available. 

  [Test Case]
  1- Use usb-creator to write a new USB device with a version of Ubuntu with a different syslinux:
     Precise: use 13.10 or later.
     Trusty: use 13.04 or earlier.
     Utopic: use 13.04 or earlier.
  2- Boot on the USB, verify that the splash screen is shown and that you can get into a live session.

  [Regression Potential]
  This may yield cases in which the written USB device may be unbootable, due to having written syslinux data to the boot sector incompatible with the version of Ubuntu to be installed. USB devices may also be bootable but not show the splash screen and menu.

  --

  系    统：UK 14.10  6-2 dailybuild 32 位
  机器型号：ｄｅｌｌ　 Ｉｎｓｐｉｒｏｎ－５６０ｓ
  现    象：用Ｕ盘制作启动盘，不能启动，提示信息：ｇfxboot.c32: not a COM32R Image boot: 见附件图片

  this bug is similar with Bug #645818, but we cannot confirm whether
  they are the same.

  WORKAROUND: One may enter the live environment by typing the following and hitting enter:
  live

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