can anyone help me with this apt update issue in ubuntu 23.10? | pressku.com

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Ign:1 https://mirror.limda.net/Ubuntu mantic InRelease Hit:2 https://dl.google.com/linux/chrome/deb unchangeable InRelease Ign:3 https://mirror.limda.net/Ubuntu mantic-updates InRelease Ign:4 https://mirror.limda.net/Ubuntu mantic-backports InRelease Ign:5 https://mirror.limda.net/Ubuntu mantic-security InRelease Err:6 https://mirror.limda.net/Ubuntu mantic Release 404 Not Found [IP: 103.163.246.243 443] Err:7 https://mirror.limda.net/Ubuntu mantic-updates Release 404 Not Found [IP: 103.163.246.243 443] Err:8 https://mirror.limda.net/Ubuntu mantic-backports Release 404 Not Found [IP: 103.163.246.243 443] Err:9 https://mirror.limda.net/Ubuntu mantic-security Release 404 Not Found [IP: 103.163.246.243 443] Get:10 https://deb.volian.org/volian scar InRelease [35.1 kB] Err:10 https://deb.volian.org/volian scar InRelease The pursuing signatures couldn't beryllium verified because nan nationalist cardinal is not available: NO_PUBKEY A87015F3DA22D980 Reading package lists... Done E: The repository 'https://mirror.limda.net/Ubuntu mantic Release' does not person a Release file. N: Updating from specified a repository can't beryllium done securely, and is truthful abnormal by default. N: See apt-secure(8) manpage for repository creation and personification configuration details. E: The repository 'https://mirror.limda.net/Ubuntu mantic-updates Release' does not person a Release file. N: Updating from specified a repository can't beryllium done securely, and is truthful abnormal by default. N: See apt-secure(8) manpage for repository creation and personification configuration details. E: The repository 'https://mirror.limda.net/Ubuntu mantic-backports Release' does not person a Release file.
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