could not load library liblwgeom-2.1.7.so

Hi,

We use the apt.postgresql.org repository for production (ubuntu) servers
and something strange just ahppended when i was working on a new server.

An upgrade of postgresql-9.3-postgis-2.1 just came in and since then
postgis is broken, because it cannot find liblwgeom-2.1.7.so

When i run a postgis function, i get this error:
=# select postgis_version();
ERROR: could not load library "/usr/lib/postgresql/9.3/lib/postgis-2.1.so":
liblwgeom-2.1.7.so: cannot open shared object file: No such file or
directory

This could be correct considering the contents of the package
liblwgeom-2.1.7
~# dpkg -L liblwgeom-2.1.7
/.
/usr
/usr/lib
/usr/lib/liblwgeom-2.1.8.so ---- wrong version!?
/usr/share
/usr/share/doc
/usr/share/doc/liblwgeom-2.1.7
/usr/share/doc/liblwgeom-2.1.7/copyright
/usr/share/doc/liblwgeom-2.1.7/changelog.gz
/usr/share/doc/liblwgeom-2.1.7/changelog.Debian.gz

This looks pretty serious, what's going on?
This might not be the right place to discuss this, does anyone know where
else i should adress my question?

Cheers,
--
Willy-Bas Loos