i am trying to update Deepin 23 with Settings Update App and with "Sudo apt Update" command in Terminal, 1st of all update speed so so slow,

and after sometime update stops with errors,

in terminal i face these errors

$ sudo apt update
[sudo] password for Taha:
Verification successful
Ign:1 http://ftp.acc.umu.se/mirror/linuxdeepin/packages panda InRelease
Err:2 http://ftp.acc.umu.se/mirror/linuxdeepin/packages panda Release
404 Not Found [IP: 194.71.11.165 80]
Hit:3 https://community-packages.deepin.com/driver-23 driver InRelease
Hit:4 https://app-store-files.uniontech.com/240816113047986/appstorev23 beige InRelease
Reading package lists... Done
E: The repository 'http://ftp.acc.umu.se/mirror/linuxdeepin/packages panda 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.