故障描述：宝塔安装不上
故障分析：yum的问题导致安装失败，更换阿里云yum即可。
处理过程方法：
1.第一步：备份 sources.list
sudo cp /etc/apt/sources.list /etc/apt/sources.list.bak
2.第二步：编辑 sources.list
sudo vim /etc/apt/sources.list
3.第三步：删除原文件内容，替换下面的阿里源！（i编辑把原来的文本全部删完，然后把下面的全部复制上去，然后：wq）
deb http://mirrors.aliyun.com/ubuntu/ bionic main restricted universe multiverse
deb http://mirrors.aliyun.com/ubuntu/ bionic-security main restricted universe multiverse
deb http://mirrors.aliyun.com/ubuntu/ bionic-updates main restricted universe multiverse
deb 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 main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ bionic-security main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ bionic-updates main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ bionic-proposed main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ bionic-backports main restricted universe multiverse
4、更新
sudo apt update
5、升级
sudo apt upgrade
yum换好以后，测试宝塔正常安装。
