执行sudo apt update 时报错，有没有什么方法解决

Get:1 http://packages.deepin.com/deepin panda InRelease [13.1 kB]
Err:1 http://packages.deepin.com/deepin panda InRelease
Clearsigned file isn't valid, got 'NOSPLIT' (does the network require authentication?)
Hit:3 https://community-packages.deepin.com/driver-23 driver InRelease
Hit:2 https://community-packages.deepin.com/beige beige InRelease
Hit:4 https://app-store-files.uniontech.com/240828161952866/appstorev23 beige InRelease
Reading package lists... Done
E: Failed to fetch http://packages.deepin.com/deepin/dists/panda/InRelease Clearsigned file isn't valid, got 'NOSPLIT' (does the network require authentication?)
E: The repository 'http://packages.deepin.com/deepin panda InRelease' is no longer signed.
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.