I've already done the configuration you suggested.
After I installed the gallery package by, apt-get install gallery (I am using Debian 3.1 with kernel 2.6).
The homepage for gallery setup display a number of unknown characters.
When I display the source code of the homepage, I found that:
<meta http-equiv="content-style-type" content="text/css">
<meta http-equiv="content-type" content="Mime-Type; charset=ISO-8859-1">
<meta name="content-language" content="zh-HK">
The content-language is zh-HK. However, there is no charset of zh-HK.
Is this the problem of apache2? If yes, doesn't it mean I need to install zh-HK charset?
Is this the problem of gallery package? If yes, how can I fix this?