apt update Updating from such a repository can‘t be done securely, and is therefore

1. 执行apt update 报错如图：

   Err:6 http://mirrors.aliyun.com/ubuntu bionic Release
   SECURITY: URL redirect target contains control characters, rejecting. [IP:
   E: The repository ‘http://mirrors.aliyun.com/ubuntu bionic Release’ no longer has a Release file.
   N: Updating from such a repository can’t be done securely, and is therefore disabled by default.
   N: See apt-secure(8) manpage for repository creation and user configuration details.

   本人将镜像配置连接由 http 修改为 https 解决 例子如下：

   • vim /etc/apt/sources.list
   • 将镜像地址
     http://mirrors.aliyun.com/ubuntu…
     修改为：
     https://mirrors.aliyun.com/ubuntu…