During installing my additional packages:

 . . .
Setting up libpcre3 (7.6-2.1) ...
Setting up locales (2.7-14) ...
Generating locales (this might take a while)...
 en_US.ISO-8859-1... done
 en_US.UTF-8... done
 zh_CN.GB2312... done
 zh_CN.UTF-8... done
 zh_HK.UTF-8... done
Generation complete.
Setting up lsof (4.78.dfsg.1-4) ...
 . . .

Then,

  Executing stage reconfigure...
Generating locales (this might take a while)...
 en_US.ISO-8859-1... done
 en_US.UTF-8... done
 zh_CN.GB2312... done
 zh_CN.UTF-8... done
 zh_HK.UTF-8... done
Generation complete.
  Executing stage hosts...

It is not a big deal for other configurations, but generating locales
takes a lot of time on my PC.