Originally Posted by falko
Yes, you should change the order.
Hmmm...didn't help. I ran dpkg-reconfigure locales and only selected en_US (even though I'm Canadian) and I have the same error in ISPConfig.
Can I just disable this check somewhere? I know this problem is somewhere on my system because I have another ISPConfig installation on another box that doesn't have this problem. On this particular box I am the only one creating accounts so I can ensure I know enough not to put any funky characters in usernames..