[Bug 1325801] Re: failed to boot from USB disk with error: gfxboot.c32: not a COM32R Image boot:

Mathieu Trudel-Lapierre mathieu.tl at gmail.com
Fri Mar 20 15:04:20 UTC 2015

** Description changed:

+ [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:

** Changed in: usb-creator (Ubuntu Utopic)
       Status: Triaged => In Progress

** Changed in: usb-creator (Ubuntu Utopic)
     Assignee: (unassigned) => Mathieu Trudel-Lapierre (mathieu-tl)

** Changed in: usb-creator (Ubuntu Trusty)
     Assignee: (unassigned) => Mathieu Trudel-Lapierre (mathieu-tl)

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

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