There is also a complete package if you do not want to roll your own. Unfortunately it does not work with Ubuntu 14.10 as of today.

Getting the drivers for the Digital Devices Cine CT V6 to work is a bit different from 14.04 as there is no prebuilt version in a PPA. So it is back to recompiling from source with every kernel update. Luckily it is fairly easy after I found this post:

It will work with Kernels up to 3.18

Build and install driver for Ubuntu 14.10

First install a few packages. Mercurial to get hg to work, ncurses and the current linux source files needed if you want to only build drivers for your card and deselect the others with make menuconfig.

sudo aptitude install mercurial git libproc-processtable-perl ncurses-dev linux-source
hg clone http://linuxtv.org/hg/~endriss/media_build_experimental
cd media_build_experimental
make download
make untar
./build --check-only
make menuconfig
make
make install

install the firmware for the card (still in the same directory):

experimental/oe/get_dvb_firmware drxk

load the kernel module

modprobe ddbridge

After a kernel update, the drivers need to be rebuilt:

cd media_build_experimental
make distclean
make untar
make menuconfig
make
make install

More information can be found on Digital Devices support page and on vdr-portal.de.

Thanks to Oliver Endriss who made this work!