安装的话，sudo apt-get
tar zxf
解压。
获得
还有一种是。
reboot重启.
必须得是root模式才可以swift.

vi命令下设置:set nu

sudo apt-get install vim

问题分析：ubuntu预装的是vim tiny版本，而需要的是vim full版本。执行下面的语句安装vim full版本：
$sudo apt-get remove vim-common
$sudo apt-get install vim
ps:这里可能遇到以下问题：
Reading package lists... Done
Building dependency tree
Reading state information... Done
Package vim is not available, but is referred to by another package.
This may mean that the package is missing, has been obsoleted, or
is only available from another source
E: Package vim has no installation candidate
解决办法：
sudo apt-get update && sudo apt-get install vim