在虚拟机新建一个Ubuntu18.04.1-live-server-amd64当做服务器
在安装软件时报错：
slave@slave:~$ sudo -s
[sudo] password for slave:
root@slave:~# apt install redis-server
Reading package lists... Done
Building dependency tree
Reading state information... Done
python3 is already the newest version (3.6.5-3ubuntu1).
0 upgraded, 0 newly installed, 0 to remove and 27 not upgraded.
root@slave:~# apt-get -f install
Reading package lists... Done
Building dependency tree
Reading state information... Done
0 upgraded, 0 newly installed, 0 to remove and 27 not upgraded.
从报错信息上看可能存在一些依赖问题或者软件源出了问题，修复一下破损的依赖关系还是一样的错误信息，此时应该更换Ubuntu的源。
如何更换Ubuntu的源
①进入root模式
sudo -s
②进入ubuntu源的目录
cd /etc/apt
③备份sources.list
cp sources.list sources.list.bak
④修改sources.list
删除sources.list中的内容，把阿里云的源复制进source.list中
vi sources.list
ubuntu 18.04(bionic)
阿里云：
deb http://mirrors.aliyun.com/ubuntu/ bionic main restricted universe multiverse deb-src http://mirrors.aliyun.com/ubuntu/ bionic main restricted universe multiverse deb http://mirrors.aliyun.com/ubuntu/ bionic-security main restricted universe multiverse deb-src http://mirrors.aliyun.com/ubuntu/ bionic-security main restricted universe multiverse deb http://mirrors.aliyun.com/ubuntu/ bionic-updates main restricted universe multiverse deb-src http://mirrors.aliyun.com/ubuntu/ bionic-updates main restricted universe multiverse deb http://mirrors.aliyun.com/ubuntu/ bionic-proposed main restricted universe multiverse deb-src http://mirrors.aliyun.com/ubuntu/ bionic-proposed main restricted universe multiverse deb http://mirrors.aliyun.com/ubuntu/ bionic-backports main restricted universe multiverse deb-src http://mirrors.aliyun.com/ubuntu/ bionic-backports main restricted universe multiverse
⑤ 更新源
apt update
6. 更新软件
apt upgrade
再次安装软件就不会报错了
