Same, and I had the issue described in the article. It's just a result of the installation process and is documented on a bug page... somewhere. What happens is

Same, and I had the issue described in the article. It's just a result of the installation process and is documented on a bug page... somewhere. What happens is that if you install Jessie from USB, a line is added into /etc/fstab for this USB drive. And this changes the usual auto-mount of USB drives later on: instead of mounting them as the logged in user, they're mounted as root, read-only. Hence the error when trying to access the USB key. Fix: just remove the USB drive entry in /etc/fstab, then it works like a charm again. Someone not installing from the USB key will not see the issue. As the issue is known it may have already been fixed in the latest Jessie installer (didn't check).