If you like me are a Linux newbie, the following helps in modifying the source file . i.e for adding in sources for Monet DB installation

sudo sh -c ‘echo “deb http://dev.monetdb.org/downloads/deb/ precise monetdb” > /etc/apt/sources.list.d/monetdb.list’
sudo sh -c ‘echo “deb-src http://dev.monetdb.org/downloads/deb/ precise monetdb” > /etc/apt/sources.list.d/monetdb.list’

ps- I was on Google compute/ Linux