备份原镜像源sudocp/etc/apt/sources.list/etc/apt/sources.list.bak修改为阿里镜像源sudotee/etc/apt/sources.list<<-'EOF'debhttp://mirrors.aliyun.com/ubuntu/bionicmainrestricteduniversemultiversedeb-srchttp://mirrors.aliyun.com/ubuntu/bionicmainrestricteduniversemultiversedebhttp://mirrors.aliyun.com/ubuntu/bi