Linux Ubuntu18出现apt-get install E: 无法定位软件包解决办法

看了网上的很多方法，总结如下

方法1：添加源

sudo cp /etc/apt/sources.list /etc/apt/sources.list-bak #先将之前的source-list备份

sudo vi /etc/apt/sources.list

#编辑镜像文件时候，要在root模式下。

#加入以下镜像
deb http://archive.ubuntu.com/ubuntu/ trusty main universe restricted multiverse

deb https://mirrors.ustc.edu.cn/ubuntu/ bionic main restricted universe multiverse
deb-src https://mirrors.ustc.edu.cn/ubuntu/ bionic main restricted universe multiverse
deb https://mirrors.ustc.edu.cn/ubuntu/ bionic-updates main restricted universe multiverse
deb-src https://mirrors.ustc.edu.cn/ubuntu/ bionic-updates main restricted universe multiverse
deb https://mirrors.ustc.edu.cn/ubuntu/ bionic-backports main restricted universe multiverse
deb-src https://mirrors.ustc.edu.cn/ubuntu/ bionic-backports main restricted universe multiverse
deb https://mirrors.ustc.edu.cn/ubuntu/ bionic-security main restricted universe multiverse
deb-src https://mirrors.ustc.edu.cn/ubuntu/ bionic-security main restricted universe multiverse
deb https://mirrors.ustc.edu.cn/ubuntu/ bionic-proposed main restricted universe multiverse
deb-src https://mirrors.ustc.edu.cn/ubuntu/ bionic-proposed main restricted universe multiverse

然后更新

sudo apt update

sudo apt upgrade

方法2：使用其他的包管理器下载安装

#新立得软件包管理器
sudo apt-get install synaptic

#启动
sudo synaptic

方法3：可能是包的名字错了（有更新）

1. 法3.1：使用tab检查
2. 法3.2：上网搜索包的名字

例如：py-kiwi更新为python-kiwi，python-gnomedesktop更新为gir1.2-goocanvas-2.0