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something error in bash while upgrading

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shamil kv
shamil kv
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Err:15 https://example.com/apt stable Release 

 404  Not Found [IP: 2600:1406:3a00:21::173e:2e65 443]

Hit:16 http://mirrors.cqu.edu.cn/ubuntu noble-security InRelease Reading package lists... Done W: http://http.kali.org/kali/dists/kali-rolling/InRelease: Key is stored in legacy trusted.gpg keyring (/etc/apt/trusted.gpg), see the DEPRECATION section in apt-key(8) for details. E: The repository 'https://example.com/apt stable 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.

Err:15 https://example.com/apt stable Release 404 Not Found [IP: 2600:1406:3a00:21::173e:2e65 443] Hit:16 http://mirrors.cqu.edu.cn/ubuntu noble-security InRelease Reading package lists... Done W: http://http.kali.org/kali/dists/kali-rolling/InRelease: Key is stored in legacy trusted.gpg keyring (/etc/apt/trusted.gpg), see the DEPRECATION section in apt-key(8) for details. E: The repository 'https://example.com/apt stable 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.
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