So I now have as only entry in my /etc/apt/preferences:
Package: *
Pin: origin schuldei.org
Pin-Priority: 999
Rationale: the man-page says about origin "fully qualified domain" and
"debian.org" is really "www.debian.org" so I did the same for
schuldei.org which is really "www.schuldei.org".
In any case: I ran apt-get update on the sources list and I would
expect
that "apt-cache policy x-window-system" would show something of the
preferences. It does not. It shows:
x-window-system:
Installed: 4.3.0-0pre1v3
Candidate: 4.3.0-0pre1v3
Version Table:
*** 4.3.0-0pre1v3 0
500 http://www.schuldei.org ./ Packages
100 /var/lib/dpkg/status
4.2.1-12.1 0
500 http://ftp.uni-erlangen.de testing/main Packages
Shouln't I see something of what I put in the preferences? Or not?
Okay, I looked back at this. Sure enough, the "origin" Pin does seem to
want the FQDN, not just the suffix. Or at least, that's the way the
output of apt-cache policy makes it look... although I think the Pin
still works. Oh well, add it to the list of APT mysteries. Try it out
and see if it works for you.