inkex.py is supplied with Inkscape, in the extensions directory (on Ubuntu I think that's /usr/share/inkscape/extensions). You either need to put eqtexsvg.py in that directory (replacing the original), or copy inkex.py into ~/.inkscape/extensions.
inkex.py is supplied with Inkscape, in the extensions directory (on Ubuntu I think that's /usr/share/ inkscape/ extensions) . You either need to put eqtexsvg.py in that directory (replacing the original), or copy inkex.py into ~/.inkscape/ extensions.