@mashiro 我猜是因为Ubuntu原镜像和你用的备用镜像在国内都超时了，或许改国内各大学的镜像会有点用（以前自己装树莓派的软件包时遇到过，现在还卡着，也改过到国内镜像，但是问题依旧）
Why is this step necessary? hello.2heng.xin might not be the server where you are registered, so we need to redirect you to your home server first. Don't have an account? You can sign up here
hello.2heng.xin
