For some reason the /etc/apt/sources.list.d/vanvugt-compiz-preproposed-precise.list sources file has the sources commented out, so you'll need to remove the # at the beginning of the two lines in that file.
For some reason the /etc/apt/ sources. list.d/ vanvugt- compiz- preproposed- precise. list sources file has the sources commented out, so you'll need to remove the # at the beginning of the two lines in that file.