执行sudo apt-get update时遇到本地CuDNN仓库无Release文件的错误求助

我在执行sudo apt-get update命令更新软件源时遇到了问题，更新结束后弹出了以下错误信息：

E: The repository 'file:/var/cudnn-local-repo-ubuntu2004-8.4.1.50  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.

E: The repository 'file:/var/cudnn-local-repo-ubuntu2004-8.6.0.163  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.

E: The repository 'file:/var/cudnn-local-repo-ubuntu2204-8.6.0.163  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.

我的系统信息如下：

• Ubuntu版本：20.04
• 系统架构：x86_64
• 版本代号：focal

我找了一圈都没找到和这个问题相关的解决方案，有没有大佬能帮我解决这个问题呀？

我还附上了完整日志的截图：

备注：内容来源于stack exchange，提问作者ABDULGHANI ALRAWI