-r, --remove Remove the specified repository
Então:
sudo add-apt-repository --remove "deb http://us.archive.ubuntu.com/ubuntu/ saucy universe multiverse"
sudo add-apt-repository --remove "deb http://us.archive.ubuntu.com/ubuntu/ saucy-updates universe multiverse"
Da próxima vez, faça
sudo add-apt-repository universe
sudo add-apt-repository multiverse
Desde:
REPOSITORY can be either a line that can be added directly to
sources.list(5), in the form ppa:<user>/<ppa-name> for adding Personal
Package Archives, or a distribution component to enable.
In the third form, the given distribution component will be enabled for
all sources.