/tmp/apt-dpkg-install-S65GMD/8-marco-common_1.24.1-3_all.deb (--unpack):
trying to overwrite
'/usr/share/themes/Gorilla/metacity-1/metacity-theme-1.xml', which is
also in package gnome-themes-more 0.9.0.deb0.8
Where do you get 'gnome-themes-more' from? At least as far as I can tell
without more digging, it isn't in current stable or testing.
It *is* available on archive.debian.org and snapshot.debian.org, with
that version number, but based on the timestamps it doesn't seem to have
been updated since 2010.
My first default would be to remove gnome-themes-more (possibly with
apt, possibly directly with dpkg), then try the '--fix-broken' step
again.
Assuming that works, I'd then follow it up by repeating the full-upgrade
step just to make sure, and then after that - if I really wanted
gnome-themes-more - try to reinstall it (preferably using an updated
package, if you can get your hands on one).