Hi Dave ;-)
Didn't you try with Uruk 2 Alpha recently ?

This comment however seems to confirm what you are experiencing, ie
I can confirm that the Trisquel iso image, while written successfully, won't boot. The resulting usb stick is not bootable, at least in a UEFI environment.I tried Debian 9.01 Mate. It works as expected with the same dd command on the same usb device

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