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

[sudodus]

I've tried 'Disks' alias gnome-disks in Lubuntu 14.04.1 and Vivid.

I could make it create an iso file from a partition, but not from the
whole drive. Trying from the whole drive gave me an error both running
as a regular user and with sudo. (I tested with a Tiny Core iso file,
which is small so it was fast.)

When I restored from the image of the partition I got a working boot
drive. (I cloned the Ubuntu mini.iso in between so that the pendrive was
changed.) I think this is not logical (and not corresponding to how dd
is used). Restoring a partition should not restore the whole drive, but
I guess it is intended to work this way.

I could make it flash, clone alias 'restore' a boot USB drive from another iso file (I tested with the Ubuntu mini.iso (because it is small
so it was fast).

-o-

Conclusion:

I'm glad that I learned about this feature of 'Disks'. It is certainly
possible to use in order to make a USB boot drive. There is an extra
'final warning window', so it should be safe enough to use. And best of
all, it offers a working solution, when the Startup Disk Creator suffers
from this really bad bug (# 1325801) plus several minor bugs.

-o-

But of course, I still think that my mkusb is better ;-)

One important extra feature of mkusb is the ability to use general
compressed image files (an iso file often contains the compressed
container squashfs, but is not itself compressed). Another extra feature
of mkusb is the ability to check if the content of the iso file matches
that of the pendrive, and suggest updating for iso-testing. And there
are several informative windows including a final warning with red
background.

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

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