I would be very grateful if someone could help to create a bootable USB stick that really works. Instead of booting I get the following error message:

Gfx.c32: not a COM32R image

I'm using the built-in Startup Disk Creator in Ubuntu 14.04. As the USB device I'm using an empty 8GB USB flash drive. The ISO image that I'm trying to install is Ubuntu 18.04.

I followed the instructions of the Startup Disk Creator app. It automatically chose the image and the USB device. After some time I got the message Installation complete.

The problem is that when I set the USB device as the first bootable device I get the message indicated above at the beginning of this post.

PS: I have looked up the answers to an equivalent question, but they didn't work for me. Is there a new version of Startup Disk Creator which has fixed bug 1325801?

  • Did you verify the downloaded image (ISO) was valid? ie. md5sum it? (help.ubuntu.com/community/HowToMD5SUM) – guiverc May 20 '18 at 6:11
  • Could it be that your processor is 32bit? So you would have to choose the 32bit version of Ubuntu (probably under alternative downloads). – muclux May 20 '18 at 6:18
  • If you can't get a 32-bit ISO image switch to a more lightweight flavor of Ubuntu that still has a 32-bit ISO image available. – karel May 20 '18 at 7:36
  • @Richardgw What you have discovered is known bug 1325801. See @ sudodus comment on it and his answer below. – N0rbert May 20 '18 at 9:46

The Ubuntu Startup Disk Creator in 14.04 LTS is buggy, and you are affected by a known bug, that is squashed by re-writing the Startup Disk Creator (from an extracting tool) to a robust cloning tool in Ubuntu 16.04 LTS (and newer versions).

I suggest that you use another tool, for example mkusb according to the following links.



If you run standard Ubuntu live, you need an extra instruction to get the repository Universe. (Kubuntu, Lubuntu ... Xubuntu have the repository Universe activated automatically.)

sudo add-apt-repository universe  # only for standard Ubuntu

sudo add-apt-repository ppa:mkusb/ppa  # and press Enter
sudo apt-get update
sudo apt-get install mkusb mkusb-nox usb-pack-efi

The following links explain what is happening, when you create a USB boot drive, and describe some tools.

Having trouble booting from flash drive


  • Thank you sudodus your answer is the best and has given me the solution, I will use the mkusb tool – Richardgw May 20 '18 at 20:17

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