Andreas,
Thank you for your insight. However, if you see the start of the thread, I
originally only used the darktable 2.4.2 package from PPA and there were no
lens data being accessed leading me to assume that there was no lensfun
attached to the distribution of darktable 2.4.2 when picked up via PPA. So
if you are correct, then there is indeed an issue with DT 2.4.2 since it is
not yielding lens correction data, no dropdown list.

On Mon, Apr 23, 2018 at 10:32 PM Andreas Schneider <a...@cryptomilk.org>
wrote:

> On Tuesday, 24 April 2018 04:33:12 CEST Daudi Amani wrote:
> > Dear Stefan,
> > Thank you for the more detailed and actionable information. Based on your
> > information, here is what I have done and the results:
> > 1. $ sudo apt-get remove darktable
> > 2. download lensfun-0.2.8.tar.gz, extract to my home directory, make &
> > install per instructions for Ubuntu 16.04
> > $  cd lensfun-<version>
> > $  mkdir cmake_build
> > $  cd cmake_build/
> > $  sudo cmake -DCMAKE_BUILD_TYPE=Release -DLENSFUN_INSTALL_PREFIX=/usr
>  ../
> > $  sudo make
> > $  sudo make install
> >
> > 3. $ sudo apt-get install darktable
> >     this installs darktable 2.4.2 from the PPA
>
> Is it possible that there is a misunderstanding how packaging in
> distributions
> works?
>
> If you want to update lensfun to a newer version you **have** to compile
> darktable against that new version too! And not only darktable every
> package
> which links against the lensfun library, e.g. hugin!
>
> The darktable debian package is built against a specific lensfuns version
> which is packaged as debian package too. If you build lensfun on your own
> and
> then install darktable again, darktable still has been built against a
> specific lensfun version. It is likely that there are incompatible changes
> between lensfun versions, so darktable will not work.
>
> Talk to the maintainers to do an update of lensfun in debian so that
> darktable
> and other packages are linked against a newer version.
>
>
>
>         Andreas
>
>
>

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