Locale is set to non-utf8

[tjbcg]

The system locale is set to a non-utf8 locale (e.g en_US instead of en_US.utf8), which causes monogame games to crash on start. Changing to utf8 in /etc/default/locale fixes it

[wouterwijsman]

That is weird. Do the monogame games work fine after you change it?
Iḿ not quite sure what is causing this issue, may be on valve, but I'm not sure.

[tjbcg]

Changing does fix the issue. Please see this (post on fez bug tracker)