When i try to start the software-properties-gtk to clean my repositories and such things, i can't start it.. When I try starting it from terminal, i get this error: " cet@Elementary-I7:~$ software-properties-gtk /usr/lib/python3/dist-packages/gi/overrides/Gtk.py:1511: Warning: /build/buildd/glib2.0-2.42.2/./gobject/gsignal.c:1211: unable to lookup signal "window-state-event" of unloaded type 'GtkDialog' initialized, argv = Gtk.init_check(sys.argv) /usr/lib/python3/dist-packages/gi/overrides/Gtk.py:1511: Warning: g_signal_add_emission_hook: assertion 'signal_id > 0' failed initialized, argv = Gtk.init_check(sys.argv) Traceback (most recent call last): File "/usr/bin/software-properties-gtk", line 101, in <module> app = SoftwarePropertiesGtk(datadir=options.data_dir, options=options, file=file) File "/usr/lib/python3/dist-packages/softwareproperties/gtk/SoftwarePropertiesGtk.py", line 169, in __init__ self.show_keys() File "/usr/lib/python3/dist-packages/softwareproperties/gtk/SoftwarePropertiesGtk.py", line 849, in show_keys for key in self.apt_key.list(): File "/usr/lib/python3/dist-packages/softwareproperties/AptAuth.py", line 75, in list for line in p: File "/usr/lib/python3.4/codecs.py", line 319, in decode (result, consumed) = self._buffer_decode(data, self.errors, final) UnicodeDecodeError: 'utf-8' codec can't decode byte 0xdf in position 1627: invalid continuation byte " It seems that it has something to do with python files and stuff.. I'm not really that smart, so is there someone here who is able to decode this error, and give me a little pointer as to what i can do to fix it? It's not that my linux is totally broken, it's just very cumbersome to not be able to use this handy tool to configure my repositories.. Thanks in advance. Carl Erik P.S I'm using latest version of Elementary