On Debian 6 servers dependancy issues are preventing me from installing nis (or any package). When I try to resolve that issue I get a python error. How do I get past this issue and re-gain the ability to install packages?

So then I tryed to resolve this by following the suggestion:

On Debian 6 servers dependency issues are preventing me from installing nis (or any package). When I try to resolve that issue I get a python error. How do I get past this issue and re-gain the ability to install packages?

So then I tried to resolve this by following the suggestion:

as requested:

apt-cache policy Package files: 100 /var/lib/dpkg/status release a=now 500 http://security.debian.org/ stable/updates/main Translation-en 500 http://security.debian.org/ stable/updates/main amd64 Packages release v=7.0,o=Debian,a=stable,n=wheezy,l=Debian-Security,c=main origin security.debian.org 500 http://ftp.us.debian.org/debian/ unstable/main Translation-en 500 http://ftp.us.debian.org/debian/ unstable/main amd64 Packages release o=Debian,a=unstable,n=sid,l=Debian,c=main origin ftp.us.debian.org Pinned packages: 

As requested:

root 14 # apt-cache policy nis libglib2.0-dev libglib2.0-0 libdbus-glib-1-2 libslp1 libglib2.0-0: Installed: 2.40.0-2 Candidate: 2.40.0-2 Version table: *** 2.40.0-2 0 500 http://ftp.us.debian.org/debian/ unstable/main amd64 Packages 100 /var/lib/dpkg/status libdbus-glib-1-2: Installed: (none) Candidate: 0.102-1 Version table: 0.102-1 0 500 http://ftp.us.debian.org/debian/ unstable/main amd64 Packages libglib2.0-dev: Installed: 2.24.2-1 Candidate: 2.40.0-2 Version table: 2.40.0-2 0 500 http://ftp.us.debian.org/debian/ unstable/main amd64 Packages *** 2.24.2-1 0 100 /var/lib/dpkg/status nis: Installed: (none) Candidate: 3.17-33 Version table: 3.17-33 0 500 http://ftp.us.debian.org/debian/ unstable/main amd64 Packages libslp1: Installed: (none) Candidate: 1.2.1-9 Version table: 1.2.1-9 0 500 http://ftp.us.debian.org/debian/ unstable/main amd64 Packages