Adding BASH_COMPLETIONS variable to xonsh rc.py.

.config/xonsh/rc.d/rc.py

@@ -16,6 +16,8 @@ xenv = __xonsh__.env
 for d in ["~/.local/bin", "~/Applications"]:
     xenv["PATH"].append(Path(d).expanduser())
 
+### BASH COMPLETIONS ###
+xenv['BASH_COMPLETIONS']='/usr/share/bash-completion/bash_completion'
 
 ### XONSH THEME ###
 xenv['XONSH_COLOR_STYLE'] = 'one-dark'