cd /etc/apt or sudo vim /etc/apt/sources.list
增加软件源：
deb http://dk.archive.ubuntu.com/ubuntu/ xenial main deb http://dk.archive.ubuntu.com/ubuntu/ xenial universe
然后
sudo apt update sudo apt-get install gcc-4.9
cd /etc/apt or sudo vim /etc/apt/sources.list
增加软件源：
deb http://dk.archive.ubuntu.com/ubuntu/ xenial main deb http://dk.archive.ubuntu.com/ubuntu/ xenial universe
然后
sudo apt update sudo apt-get install gcc-4.9
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