[Bug 1747329] Re: Workaround needed to boot from USB stick - "gfxboot.c32: not a COM32R image"

[Steve Langasek]

> Created USB boot stick.

This glosses over what steps you're taking here, and is the actual
source of the bug.

The images that we produce are bootable images which, if copied directly
to a USB stick, do not have this error.

But you are using some other tool to write the image to a USB stick, and
in the process this other tool is modifying the image.  It is injecting
its own bootloader blocks into the disk which are incompatible with the
versions that are shipped in Ubuntu 18.04.

If you are using usb-creator, than this is a duplicate of LP: #1325801
in the usb-creator package.  The workaround is to not use usb-creator to
write your images to the USB stick.  You should use 'dd' instead, which
is reliable and whose only limitation is that it doesn't set up
persistent storage for your live session.

In any case this is definitely not a bug in grub, because you're not
using grub when booting this image on a BIOS system; you're using
isolinux which is a different bootloader.

** Package changed: grub (Ubuntu) => syslinux (Ubuntu)

** Changed in: syslinux (Ubuntu)
       Status: Incomplete => Invalid

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https://bugs.launchpad.net/bugs/1747329

Title:
  Workaround needed to boot from USB stick - "gfxboot.c32: not a COM32R
  image"

Status in syslinux package in Ubuntu:
  Invalid

Bug description:
  So, last night I downloaded the latest daily build of Lubuntu 18.04 from here:
  http://cdimage.ubuntu.com/lubuntu/daily-live/current/
  Checked 256SHAsum, all OK. Created USB boot stick.

  Got the same error message as listed in the below post:
  https://askubuntu.com/questions/486602/ubuntu-14-04-lts-live-usb-boot-error-gfxboot-c32not-a-valid-com32r-image
   - The fix mentioned in that post worked for me (upon getting that message, press TAB, type "live" & press enter.) 

  Installing on a 2005-era Dell Latitude D610 laptop, 1.2GB RAM.
   
  Thanks,
  Ken.
  ***

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