This shows before and after the fix:
~$ fc-list : family | grep Ubuntu Ubuntu,Ubuntu Thin Ubuntu Ubuntu Condensed Ubuntu,Ubuntu Light Ubuntu Mono
~$ fc-list : family | grep Ubuntu Ubuntu Light Ubuntu Ubuntu Condensed Ubuntu Medium Ubuntu Thin Ubuntu Mono
This shows before and after the fix:
~$ fc-list : family | grep Ubuntu
Ubuntu,Ubuntu Thin
Ubuntu
Ubuntu Condensed
Ubuntu,Ubuntu Light
Ubuntu Mono
~$ fc-list : family | grep Ubuntu
Ubuntu Light
Ubuntu
Ubuntu Condensed
Ubuntu Medium
Ubuntu Thin
Ubuntu Mono