FYI: I've already got all of these repos enabled on my device and I still get the dependency conflict.

Possibly I've installed a package via dpkg -i that includes a package that the installation of python-ttk2 conflicts with.

That way, python-ttk2 can't be installed and so when I try to install Panucci I see the missing dependency error.

This probably just highlights the hazards of side loading .deb files with dpkg instead of with apt-get or via the Application Manager GUI.