W: Failed to fetch http://ppa.launchpad.net/ubuntu-toolchain-r/test/ubuntu/dists/wheezy/main/source/Sources 404 Not Found
W: Failed to fetch http://ppa.launchpad.net/ubuntu-toolchain-r/test/ubuntu/dists/wheezy/main/binary-amd64/Packages 404 Not Found
gcc-4.9说啥也安装不上
root@root:~# apt-get install gcc-4.9 g++-4.9
Reading package lists... Done
Building dependency tree
Reading state information... Done
E: Unable to locate package gcc-4.9
E: Couldn't find any package by regex 'gcc-4.9'
E: Unable to locate package g++-4.9
E: Couldn't find any package by regex 'g++-4.9'