sudo vi /etc/apt/sources.list
#** [ sources.list ] *******************
deb http://mirrordirector.raspbian.org/raspbian/ wheezy main contrib non-free rpi
↓
#deb http://mirrordirector.raspbian.org/raspbian/ wheezy main contrib non-free rpi

追加
# Oxford University mirror
deb http://mirror.ox.ac.uk/sites/archive.raspbian.org/archive/raspbian wheezy main contrib non-free rpi
#***************************************
apt-get update

こんな感じでいけました