ubuntu 下安裝 vim 編輯器的問題解決

問題描述：　

root@zhouls-virtual-machine:~# apt-get install vim
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
root@zhouls-virtual-machine:~#

如下圖：

解決辦法：

　　sudo apt-get update && sudo apt-get install vim

成功嘍！！