Raspberry Pi RaspbianをWheezyからjessie

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sudo nano /etc/apt/sources.list

deb http://ftp.jaist.ac.jp/raspbian/ jessie main contrib non-free rpi
deb-src http://ftp.jaist.ac.jp/raspbian/ jessie main contrib non-free rpi
sudo apt-get update
sudo apt-get upgrade
sudo apt-get dist-upgrade

#不要なパッケージの削除
sudo apt-get autoremove

#最新版以外のソースファイルを削除
sudo apt-get autoclean
sudo apt-get install -t jessie gcc-4.8 g++-4.8
sudo update-alternatives --remove-all gcc 
sudo update-alternatives --remove-all g++
sudo update-alternatives --install /usr/bin/gcc gcc /usr/bin/gcc-4.6 20
sudo update-alternatives --install /usr/bin/gcc gcc /usr/bin/gcc-4.8 50
sudo update-alternatives --install /usr/bin/g++ g++ /usr/bin/g++-4.6 20
sudo update-alternatives --install /usr/bin/g++ g++ /usr/bin/g++-4.8 50
sudo update-alternatives --config gcc
sudo update-alternatives --config g++