usb-creator-gtk created the live part of the installer, but crashed with
segfault and failed to create a casper-rw file.

I think it is Bug #915626

"usb-creator-gtk crashed with SIGSEGV in _dbus_watch_invalidate"

because the error output contains

'Failed to connect to socket /tmp/dbus-(and a temporary file string)'
-----
The pendrive made during the attempt described above did not boot at all. I 
should add that I told usb-creator-gtk to 'erase the disk'.

I wiped the first megabyte (dd with zeros), used gparted to make a new
partition table and a partition with fat32. Then I tried usb-creator-gtk
again. I got the same or a similar segfault, but this time the casper-rw
file was created and the drive could boot. There is even persistence
now.

Conclusion:

Erasing a USB pendrive with usb-creator-gtk is not enough to make it
work properly.

Wiping the first megabyte (dd with zeros) will make it stop and
complain.

It is necessary to make a partition table. I made a partition and a file
system too, did not test the other alternatives.

So to increase the chances to succeed with usb-creator-gtk, I recommend
wiping the first megabyte and making a new msdos partition table,
partition and fat32 file system.

Comment:

usb-creator-gtk should be able to do all that by itself, when told to 'erase 
the disk'.
-----
So finally the program did its job, although it reported a segfault instead of 
normal termination.

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https://bugs.launchpad.net/bugs/915626

Title:
  usb-creator-gtk crashed with SIGSEGV in _dbus_watch_invalidate

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