Hello,
recently siduction has simplified its repo structure. The siduction "base" repo was moved to "extra".
Sorry, for the inconvenience.
Some months ago Debian also has replaced the redirector http.debian.net by httpredir.debian.org.
So it's a good opportunity to check your sources, because ... almost everything changed.
This output was created with siduction 2015-1 dev-release [with non-free content not disabled]:
root@sidbox:~# inxi -r
Repos:
Active apt sources in file /etc/apt/sources.list.d/debian.list
deb http://httpredir.debian.org/debian/ unstable main contrib non-free
Active apt sources in file /etc/apt/sources.list.d/extra.list
deb http://ftp.spline.de/pub/siduction/extra unstable main
Active apt sources in file /etc/apt/sources.list.d/fixes.list
deb http://ftp.spline.de/pub/siduction/fixes unstable main contrib non-free
Contrib and non-free archives do exist in the extra repo, so users might later add those.
At the moment for the old xserver 17.3 there is fglrx-driver and nvidia-driver in debian.
greetings
musca