Long time, but maybe some other can help himself out.
for ubuntu and mint ubuntu based realeases (do not do this for debian or mint DE)
add from console: ppa:pmjdebruijn/darktable-release
as told here
https://launchpad.net/+help-soyuz/ppa-sources-list.html
find link on page->read installation instructions
basicly insert ppa, accept key, and thereafter get apt-update.
now install latest darktable (1.6.3 at the moment) and lensfun-data from your software manager (synaptics for example or from console directly)
and it works... with latest lens-fun.