I gave up on Jessie, and installed Stretch as you and others in the debian-users mailing list advised.
Installing Debian Stretch (testing) from this link: <https://cdimage.debian.org/cdimage/...md64/iso-dvd/firmware-testing-amd64-DVD-1.iso> on the Udoo X86 required placing the rtl8168g-2.fw driver in the root directory of the USB ISO installation medium to support the Edimax Nano 150Mbps Wireless 802.11b/g/n USB Adapter. The driver was downloaded from this page: https://packages.debian.org/source/stretch/firmware-nonfree http://http.debian.net/debian/pool/non-free/f/firmware-nonfree/firmware-nonfree_20161130.orig.tar.xz The specific 'rtl8168g-2.fw' driver required was extracted from the compressed tar archive with 7-Zip. Stretch runs great!
