Actually reformating the USB key from ext4 to ntfs worked...
/me banging head against the table: DEVELOPERS! DEVELOPERS! DEVELOPERS!
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Confirming on 15.10. No trick works for me.
FYI tried to reformat the USB drive a couple of times using gparted and I get
there:
"Partition(s) 1 on /dev/sdb have been written, but we have been unable to
inform the kernel of the change, probably because it/they are in use. As a
result, the old