That is probably true. However there was an update about two weeks ago which messed up my locale settings. I’m 100% sure I did not mess that up myself.
All of a sudden Gnome Terminal was not starting anymore. After installing Deepin Terminal it showed me the same error message “_p9k_init_params:72: character not in range”
as @bkarlan got.
This specific error can be fixed by selecting the correct locale /etc/locale.gen and running locale-gen. See also: Terminal stopped working: _p9k_init_params:72: character not in range manjaro%