Installing gcc4.8 for C++11 support on ubuntu

sudo add-apt-repository ppa:ubuntu-toolchain-r/test sudo apt-get update sudo apt-cache search "g\+\+" sudo apt-get install gcc-4.8 g++-4.8 New problem : now system have 2 gcc compiler version 4.6 and 4.8. use following direction. sudo update-alternatives --install /usr/bin/g++ g++ /usr/bin/g++-4.8 20 sudo update-alternatives --install /usr/bin/gcc gcc /usr/bin/gcc-4.8 20 sudo update-alternatives --config gcc sudo update-alternatives --config g++