Erro ao executar apt-get update

1. Erro ao executar apt-get update

Thuplek
(usa KUbuntu)

Enviado em 19/09/2018 - 17:45h

quando executo sudo apt-get update
ele me da a seguinte mensagem

Err:1 http://br.archive.ubuntu.com/ubuntu bionic InRelease
403 Forbidden [IP: 200.236.31.4 80]
Err:2 http://security.ubuntu.com/ubuntu bionic-security InRelease
403 Forbidden [IP: 91.189.91.26 80]
Err:3 http://br.archive.ubuntu.com/ubuntu bionic-updates InRelease
403 Forbidden [IP: 200.236.31.4 80]
Err:4 http://br.archive.ubuntu.com/ubuntu bionic-backports InRelease
403 Forbidden [IP: 200.236.31.4 80]
Lendo listas de pacotes... Pronto
N: See apt-secure(8) manpage for repository creation and user configuration details.
N: Updating from such a repository can't be done securely, and is therefore disabled by default.
E: The repository 'http://br.archive.ubuntu.com/ubuntu bionic InRelease' is not signed.
E: Falhou ao buscar http://br.archive.ubuntu.com/ubuntu/dists/bionic/InRelease 403 Forbidden [IP: 200.236.31.4 80]
N: See apt-secure(8) manpage for repository creation and user configuration details.
N: Updating from such a repository can't be done securely, and is therefore disabled by default.
E: The repository 'http://security.ubuntu.com/ubuntu bionic-security InRelease' is no longer signed.
E: Falhou ao buscar http://security.ubuntu.com/ubuntu/dists/bionic-security/InRelease 403 Forbidden [IP: 91.189.91.26 80]
E: Falhou ao buscar http://br.archive.ubuntu.com/ubuntu/dists/bionic-updates/InRelease 403 Forbidden [IP: 200.236.31.4 80]
E: The repository 'http://br.archive.ubuntu.com/ubuntu bionic-updates 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.
E: Falhou ao buscar http://br.archive.ubuntu.com/ubuntu/dists/bionic-backports/InRelease 403 Forbidden [IP: 200.236.31.4 80]
E: The repository 'http://br.archive.ubuntu.com/ubuntu bionic-backports 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.

como resolvo isso??????

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