At first, please switch to English? Obwohl ich dich ja gut verstehe

When did you install? From which repo (must be testing or devel)? Just checked and latest version is not yet available. So I assume you got 17-1 which did not have the dependency, so probably you are missing i2c-tools. Check via
dpkg -l | grep i2c
and if not
sudo apt-get install i2c-tools
with testing (or devel) repo enabled.
Alles klar? Meld dich wieder...