Bug#388769: installer hangs when installing packages; no abort possible

[Wolfgang Köbler <wolfgang@koebler.com>]

I also tried to install debian behind an apt-proxy and the installations hangs
when fetching packages during installation (Errormsg on ALT-F4). 

It seems that all Debian etch installations behind a sarge apt-proxy 
fail because of apt-proxy bug 374405:
> Incompatible with full URL HTTP requests from recent apt versions
> http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=374405

Upgrading the apt-proxy from sarge to backports.org solved the 
installation-problem.

Bye,
Wolfgang