每当我尝试使用 apt-get update 进行更新时，我的 Ubuntu 16.04 虚拟机都会遇到这些错误
W: The repository 'http://security.ubuntu.com/ubuntu xenial-security Release' does not have a Release file.
N: Data from such a repository can't be authenticated and is therefore potentially dangerous to use.
N: See apt-secure(8) manpage for repository creation and user configuration details.
W: The repository 'http://us.archive.ubuntu.com/ubuntu xenial Release' does not have a Release file.
N: Data from such a repository can't be authenticated and is therefore potentially dangerous to use.
N: See apt-secure(8) manpage for repository creation and user configuration details.
W: The repository 'http://us.archive.ubuntu.com/ubuntu xenial-updates Release' does not have a Release file.
N: Data from such a repository can't be authenticated and is therefore potentially dangerous to use.
N: See apt-secure(8) manpage for repository creation and user configuration details.
W: The repository 'http://us.archive.ubuntu.com/ubuntu xenial-backports Release' does not have a Release file.
N: Data from such a repository can't be authenticated and is therefore potentially dangerous to use.
N: See apt-secure(8) manpage for repository creation and user configuration details.
E: Failed to fetch http://security.ubuntu.com/ubuntu/dists/xenial-security/main/binary-amd64/Packages 403 Forbidden [IP: 91.189.91.24 80]
E: Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/xenial/main/binary-amd64/Packages 403 Forbidden [IP: 91.189.91.14 80]
E: Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/xenial-updates/main/binary-amd64/Packages 403 Forbidden [IP: 91.189.91.14 80]
E: Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/xenial-backports/main/binary-amd64/Packages 403 Forbidden [IP: 91.189.91.14 80]
我正在使用全新安装的 Ubuntu 16.04 进行比赛练习，在比赛中遇到了同样的错误。
答案1
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