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

[sudodus]

This time it worked better. It was possible to install the bootloader,
and the Startup Disk Creator finished with a window

"The installation has finished ..."
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tester at tester-SATELLITE-PRO-C850-19W:~$ sudo killall usb-creator-helper ; sudo /usr/share/usb-creator/usb-creator-helper
[sudo] password for tester: 
usb-creator-helper: ingen process hittades
DEBUG:root:Unmounting /dev/sdb1
DEBUG:root:['dd', 'if=/dev/zero', 'of=/dev/sdb', 'bs=446', 'count=1']
DEBUG:root:['mount', '-r', '-o', 'loop', b'/home/tester/H\xc3\xa4mtningar/vivid-desktop-amd64.iso', '/tmp/tmpy5cw14c0']
DEBUG:root:['mount', '-o', 'remount,rw', dbus.String('/dev/sdb1')]
DEBUG:root:WTF?!: /dev/sdb1
DEBUG:root:['mount', '-r', '-o', 'loop', b'/media/tester/246D-CF02/casper/filesystem.squashfs', '/tmp/tmpsql3x1em']
DEBUG:root:['/tmp/tmpsql3x1em/usr/bin/syslinux', '-f', dbus.String('/dev/sdb1')]
DEBUG:root:['dd', 'if=/tmp/tmpsql3x1em/usr/lib/SYSLINUX/mbr.bin', 'of=/dev/sdb', 'bs=446', 'count=1', 'conv=sync']
DEBUG:root:['umount', '/tmp/tmpsql3x1em']
DEBUG:root:['/sbin/parted', '/dev/sdb', 'set', '1', 'boot', 'on']
DEBUG:root:['umount', dbus.String('/dev/sdb1')]
DEBUG:root:['umount', dbus.String('/tmp/tmpy5cw14c0')]
DEBUG:root:Asked to run KVM with 2060.679688 M free
DEBUG:root:Shutting down.
tester at tester-SATELLITE-PRO-C850-19W:~$ 
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It is still disliking the pendrive, but installed to it anyway. And it
finished nicely by unmounting the pendrive and the loop mounted devices
(which it did not with the i386 iso file as a source).

The pendrive is good. I can boot a[nother] computer with it, and the
live session works well :-)

The option to create persistence (and select the size of the casper-rw
file) has disappeared. It seems to be because of the -n option. (This is
not a problem for me, because I know how to create persistence manually.
But some beginners would appreciate the built-in option to create
persistence.)

So I flashed the amd64 iso to the pendrive again, this time without -n
and created persistence (I selected 1.5 GB).

This was a big step forward :-)

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https://bugs.launchpad.net/bugs/1325801

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

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