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I just tried https://rcn-ee.net/deb/rootfs/trusty/ubuntu-14.04-console-armhf-2014-07-06.tar.xz and found that it was a debian wheezy image instead of the advertized ubuntu image.
The previous image from that download location is working for me though. My apt-get upgrade has just finished successfully.
odd, as all the image generation steps are scripted. I just finished uploading 2014-08-13, and tested every *.img for both ubuntu/debian. They all came out fine, so i wonder why 2014-07-06 didn't work..