Bug#385271: Debian Installer unreliable
Turns out that the problem reported is in fact 2 completely unrelated
bugs. The one of the second paragraph is due to a problem Linux has with
my CD drive. What is left is the following possible bug:
When the debian-installer cannot successfully download a package from
the net due to a broken TCP connection, it does neither re-try to fetch
the package nor does it prompt the user what to do.
When I installed that day the installer did *not* inform me of any
packages it failed to download or install, although half the packages
were missing after re-boot (I only got the command line, no gnome).
I cannot reproduce this now since my ISP is working fine again.
If you are convinced that the debian-installer *does* warn users about
failed downloading then consider this bug closed by my side since I
can't reproduce it.