For me the problem went away after I reinstalled "gnome-desktop environment" and "ubuntu-desktop"; initially, metacity was complaining about a file inside $HOME/.config/metacity/, which wasn't there to begin with.
For me the problem went away after I reinstalled "gnome-desktop environment" and "ubuntu-desktop"; initially, metacity was complaining about a file inside $HOME/. config/ metacity/ , which wasn't there to begin with.