Hi I have the same problem
sudo apt-get install gnome-shell
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.
gnome-shell: Depends: gobject-introspection-glib-2.0 but it is not installable
Depends: gobject-introspection-freedesktop but it is not
installable
Depends: gobject-introspection-repository but it is not
installable
E: Broken packages
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[lucid] unable to install gnome-shell
https://bugs.launchpad.net/bugs/498493
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