ubuntu16.0.4 update git

Ubuntu 16.04 comes with Git 2.7.x, which is a little old now. As versions 2.8 & 2.9 are not part of the Ubuntu repositories, you need to add the git-core personal package archive.

Open up a terminal and run the following commands, supplying your password when prompted.

sudo add-apt-repository ppa:git-core/ppa
sudo apt-get update
sudo apt-get install git

　如果在执行第一条命令的时候出现：

sudo: add-apt-repository: command not found

　　可以先执行以下命令：

sudo apt-get install software-properties-common python-software-properties