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
boot:
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?
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.
help.ubuntu.com/community/mkusb
help.ubuntu.com/community/mkusb/persistent
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.
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