If you are using an http proxy server you must set the http_proxy environment variable first, see sources.list(5)
The dselect method actually is a set of wrapper scripts to
apt-get. The method actually provides more functionality than is
present in apt-get alone.
APT however considers all known dependencies and attempts to prevent broken packages
APT User's Guide
$Id: guide.sgml,v 1.4 2001/04/10 07:02:55 jgg Exp $jgg@debian.org