I have tried multiple times to update the os but every time it showing me the errors . I have tried to resolve the error but nothing works.Note: I have attached the error for your reference . It wil be very helpful if you try to help me .Reading package lists... DoneW: http://deb.anydesk.com/dists/all/InRelease: Key is stored in legacy trusted.gpg keyring (/etc/apt/trusted.gpg), see the DEPRECATION section in apt-key(8) for details.W: GPG error: http://deb.anydesk.com all InRelease: The following signatures were invalid: EXPKEYSIG 18DF3741CDFFDE29 philandro Software GmbH E: The repository 'http://deb.anydesk.com all InRelease' is not 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.W: GPG error: https://dl.google.com/linux/chrome/deb stable InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY E88979FB9B30ACF2E: The repository 'https://dl.google.com/linux/chrome/deb stable InRelease' is not 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.W: http://repo.mysql.com/apt/debian/dis...sie/InRelease: Key is stored in legacy trusted.gpg keyring (/etc/apt/trusted.gpg), see the DEPRECATION section in apt-key(8) for details.W: GPG error: http://repo.mysql.com/apt/debian jessie InRelease: The following signatures were invalid: EXPKEYSIG 8C718D3B5072E1F5 MySQL Release Engineering E: The repository 'http://repo.mysql.com/apt/debian jessie InRelease' is not 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.W: GPG error: https://brave-browser-apt-release.s3.brave.com stable InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 0686B78420038257E: The repository 'https://brave-browser-apt-release.s3.brave.com stable InRelease' is not 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.W: GPG error: https://repo.protonvpn.com/debian stable InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 8DD48989F43719CAE: The repository 'https://repo.protonvpn.com/debian stable InRelease' is not 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.W: GPG error: http://repository.spotify.com stable InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 6224F9941A8AA6D1E: The repository 'http://repository.spotify.com stable InRelease' is not 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.W: Target Packages (main/binary-amd64/Packages) is configured multiple times in /etc/apt/sources.list.d/anydesk-stable.list:1 and /etc/apt/sources.list.d/anydesk.list:1W: Target Packages (main/binary-all/Packages) is configured multiple times in /etc/apt/sources.list.d/anydesk-stable.list:1 and /etc/apt/sources.list.d/anydesk.list:1W: Target Translations (main/i18n/Translation-en_US) is configured multiple times in /etc/apt/sources.list.d/anydesk-stable.list:1 and /etc/apt/sources.list.d/anydesk.list:1W: Target Translations (main/i18n/Translation-en) is configured multiple times in /etc/apt/sources.list.d/anydesk-stable.list:1 and /etc/apt/sources.list.d/anydesk.list:1W: Target Contents-deb (main/Contents-amd64) is configured multiple times in /etc/apt/sources.list.d/anydesk-stable.list:1 and /etc/apt/sources.list.d/anydesk.list:1W: Target Contents-deb (main/Contents-all) is configured multiple times in /etc/apt/sources.list.d/anydesk-stable.list:1 and /etc/apt/sources.list.d/anydesk.list:1