Hello,
When a default-installation language is set to Japanese, set-language-env does not work correctly:
that means display does not show instructions in Japanese (maybe failed in charanter encoding?) as follows,
please see a page http://cgi.f40.aaacafe.ne.jp/~green/index.php?Sarge-set-language-env
I am not sure, but it seems that there exists script errors in installation-process.
Regards,
Green.