Failed to start gdm after updation

Hi Gnuers,

I installed Debian Gnu/Linux Operating System and updated it from internet from a nearest mirror. ftp.iitm.ac.in

I edited the sources.list file in /etc/apt/sources.list with teh following line

deb ftp://ftp.iitm.ac.in/debian unstable main contrib non-free

and then opened tehterminal in root and did apt-get update.

and then apt-get dist-upgrade.

Now teh problem is after the entire OS is upgraded and when I reboot my system GDm was unable to start.

I tried with /etc/init.d/gdm start but also there is no use.

My PC is IBM Think Pad and with Intel Processor. What might be the problem and also can anyone please help me how to solve out this problem.

When I am trying to install gdm in terminal mode..
I coould see teh following error

iiim:/home/soumya# apt-get install gdm
Reading package lists... Done
Building dependency tree... 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.

Since you only requested a single operation it is extremely likely that
the package is simply not installable and a bug report against
that package should be filed.
The following information may help to resolve the situation:

The following packages have unmet dependencies:
gdm: Depends: libglade2-0 (>= 1:2.6.1) but 1:2.6.0-4 is to be installed
Depends: libgtk2.0-0 (>= 2.12.0) but 2.8.20-7 is to be installed
Depends: libpango1.0-0 (>= 1.20.0) but 1.14.8-5 is to be installed
Depends: librsvg2-2 (>= 2.18.1) but 2.14.4-2 is to be installed
libfontconfig1: Depends: fontconfig-config (= 2.5.0-2) but it is not going to be installed
libpango1.0-0: Depends: libpango1.0-common (>= 1.14.8-5) but it is not going to be installed
E: Broken packages
iiim:/home/soumya#