Deepin 15.11 적절한 업데이트 실패

나는 15.11을 사용하고 있으며 /etc/apt/source.list를 다음으로 변경했습니다.

deb [by-hash=force] http://mirrors.aliyun.com/deepin lion main contrib non-free

Alibaba의 공식 가이드를 따르지만 사용할 apt update때

Ign:1 http://mirrors.aliyun.com/deepin lion InRelease
Hit:2 http://packages.microsoft.com/repos/vscode stable InRelease
Err:3 http://mirrors.aliyun.com/deepin lion Release      
  404  Not Found [IP: 222.186.18.240 80]
Hit:4 https://packages.microsoft.com/ubuntu/16.04/prod xenial InRelease
Reading package lists... Done
E: The repository 'http://mirrors.aliyun.com/deepin lion Release' does not have 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.

전에는 성공했는데 apt update오늘은 실패했어요. 왜 그런지 모르겠어요. 도와주실 수 있나요? 감사해요.