ubuntu高版本安装低版本gcc
试了网上的切换源或从源码下载，不成功。
最后成功安装的方法：
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| cd Desktop/
mkdir install_g++-4.8
cd install_g++-4.8/
sudo apt update
wget http://mirrors.kernel.org/ubuntu/pool/universe/g/gcc-4.8/g++-4.8_4.8.5-4ubuntu8_amd64.deb
wget http://mirrors.kernel.org/ubuntu/pool/universe/g/gcc-4.8/libstdc++-4.8-dev_4.8.5-4ubuntu8_amd64.deb
wget http://mirrors.kernel.org/ubuntu/pool/universe/g/gcc-4.8/gcc-4.8-base_4.8.5-4ubuntu8_amd64.deb
wget http://mirrors.kernel.org/ubuntu/pool/universe/g/gcc-4.8/gcc-4.8_4.8.5-4ubuntu8_amd64.deb
wget http://mirrors.kernel.org/ubuntu/pool/universe/g/gcc-4.8/libgcc-4.8-dev_4.8.5-4ubuntu8_amd64.deb
wget http://mirrors.kernel.org/ubuntu/pool/universe/g/gcc-4.8/cpp-4.8_4.8.5-4ubuntu8_amd64.deb
wget http://mirrors.kernel.org/ubuntu/pool/universe/g/gcc-4.8/libasan0_4.8.5-4ubuntu8_amd64.deb
sudo apt install ./gcc-4.8_4.8.5-4ubuntu8_amd64.deb ./gcc-4.8-base_4.8.5-4ubuntu8_amd64.deb ./libstdc++-4.8-dev_4.8.5-4ubuntu8_amd64.deb ./cpp-4.8_4.8.5-4ubuntu8_amd64.deb ./libgcc-4.8-dev_4.8.5-4ubuntu8_amd64.deb ./libasan0_4.8.5-4ubuntu8_amd64.deb ./g++-4.8_4.8.5-4ubuntu8_amd64.deb
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