Ubuntu安装应用时出现Unable to locate package ...

我是在vps（国外服务器）安装php7的时候遇到这个问题，始终提示：

Couldn't find any package by regex 'php7.0'

Unable to locate package php7.0

找了很久，网上很多解决方案都是：

$ sudo add-apt-repository ppa:ondrej/php
$ sudo apt-get update
之后执行安装
$ sudo apt-get install -y php7.0 php7.0-mysql php7.0-curl php7.0-json php7.0-cgi
但是我执行了代码之后，仍然提示：

Couldn't find any package by regex 'php7.0'

Unable to locate package php7.0

 

最后找到解决方案，说是apt源不对，换成了阿里云的源

cp /etc/apt/sources.list /etc/apt/sources.list.bak
vi /etc/apt/sources.list
sources.list内容如下：

deb-src http://archive.ubuntu.com/ubuntu xenial main restricted #Added by software-properties
deb http://mirrors.aliyun.com/ubuntu/ xenial main restricted
deb-src http://mirrors.aliyun.com/ubuntu/ xenial main restricted multiverse universe #Added by software-properties
deb http://mirrors.aliyun.com/ubuntu/ xenial-updates main restricted
deb-src http://mirrors.aliyun.com/ubuntu/ xenial-updates main restricted multiverse universe #Added by software-properties
deb http://mirrors.aliyun.com/ubuntu/ xenial universe
deb http://mirrors.aliyun.com/ubuntu/ xenial-updates universe
deb http://mirrors.aliyun.com/ubuntu/ xenial multiverse
deb http://mirrors.aliyun.com/ubuntu/ xenial-updates multiverse
deb http://mirrors.aliyun.com/ubuntu/ xenial-backports main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ xenial-backports main restricted universe multiverse #Added by software-properties
deb http://archive.canonical.com/ubuntu xenial partner
deb-src http://archive.canonical.com/ubuntu xenial partner
deb http://mirrors.aliyun.com/ubuntu/ xenial-security main restricted
deb-src http://mirrors.aliyun.com/ubuntu/ xenial-security main restricted multiverse universe #Added by software-properties
deb http://mirrors.aliyun.com/ubuntu/ xenial-security universe
deb http://mirrors.aliyun.com/ubuntu/ xenial-security multiverse

保存之后执行更新命令，更新apt源：

sudo apt-get update

更新apt源之后，然后添加第三方源支持，并且再次更新apt源：

add-apt-repository ppa:ondrej/php

sudo apt-get update

最后执行php的安装：

sudo apt-get install -y php7.0 php7.0-mysql php7.0-curl php7.0-json php7.0-cgi