There's a trick you can use to bypass the problem and it's sudo dpkg -i --force-all /var/cache/apt/archives/gnome-session_3.0.1-0ubuntu1~build2_all.deb
It solved for me, but it's just a temporary workaround ;)
There's a trick you can use to bypass the problem and it's apt/archives/ gnome-session_ 3.0.1-0ubuntu1~ build2_ all.deb
sudo dpkg -i --force-all /var/cache/
It solved for me, but it's just a temporary workaround ;)