Missing many packages and libraries

[Brett Mahar <brett.mahar@gmail.com>]

Hi all,
I installed Debian a few days ago and had no trouble downloading extra
packages using apt-get. Then I re-installed today, and hardly anything
will work (Transmission did install). Any idea what is wrong?

My updated sources.list file:
deb cdrom:[Debian GNU/Linux 5.0.5 _Lenny_ - Official i386 CD Binary-1
20100626-17:37]/ lenny main
deb http://security.debian.org/ lenny/updates main
deb-src http://security.debian.org/ lenny/updates main
deb http://volatile.debian.org/debian-volatile lenny/volatile main
deb-src http://volatile.debian.org/debian-volatile lenny/volatile main
deb http://ftp.au.debian.org/debian/dists/lenny/ main contrib non-free
deb http://ftp.de.debian.org/debian/dists/lenny/ main contrib non-free

I ran apt-get update (as root), then tried installing many things, eg:

debian:/home/brett# apt-get install mozilla-plugin-vlc
Reading package lists... Done
Building dependency tree
Reading state information... Done
Some packages could not be installed. This may mean that you have
requested an impossible situation or if you are using the unstable
distribution that some required packages have not yet been created
or been moved out of Incoming.
The following information may help to resolve the situation:

The following packages have unmet dependencies:
  mozilla-plugin-vlc: Depends: vlc-nox (= 0.8.6.h-4+lenny2.3) but it
is not going to be installed
                      Depends: vlc but it is not going to be installed
                      Depends: libavcodec51 (>= 0.svn20080206-8) but
it is not going to be installed or
                               libavcodec-unstripped-51 (>=
0.svn20080206-8) but it is not installable
                      Depends: libvlc0 (>= 0.8.6.h) but it is not
going to be installed
E: Broken packages


debian:/home/brett# apt-get install gstreamer-tools
Reading package lists... Done
Building dependency tree
Reading state information... Done
E: Couldn't find package gstreamer-tools


debian:/home/brett# apt-get install openoffice.org
Reading package lists... Done
Building dependency tree
Reading state information... Done
Some packages could not be installed. This may mean that you have
requested an impossible situation or if you are using the unstable
distribution that some required packages have not yet been created
or been moved out of Incoming.
The following information may help to resolve the situation:

The following packages have unmet dependencies:
  openoffice.org: Depends: openoffice.org-core (=
1:2.4.1+dfsg-1+lenny7) but it is not going to be installed
                  Depends: openoffice.org-writer but it is not going
to be installed
                  Depends: openoffice.org-calc but it is not going to
be installed
                  Depends: openoffice.org-impress but it is not going
to be installed
                  Depends: openoffice.org-draw but it is not going to
be installed
                  Depends: openoffice.org-math but it is not going to
be installed
                  Depends: openoffice.org-base but it is not going to
be installed
                  Depends: openoffice.org-report-builder-bin but it is
not going to be installed
                  Depends: ttf-liberation but it is not installable
                  Depends: openoffice.org-officebean but it is not
going to be installed
                  Depends: openoffice.org-writer2latex but it is not installable
                  Depends: openoffice.org-filter-mobiledev but it is
not going to be installed
                  Depends: openoffice.org-java-common (> 2.2.0-4) but
it is not going to be installed
                  Recommends: openoffice.org-filter-binfilter but it
is not going to be installed
E: Broken packages

Thanks in advance!
Brett.