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Ubuntu 18.04 LTSのアップグレードが403 Forbiddenエラーで失敗する

    Err:1 http://security.ubuntu.com/ubuntu bionic-security InRelease
  403  Forbidden [IP: 91.189.91.26 80]
Err:2 http://ppa.launchpad.net/gnome3-team/gnome3-staging/ubuntu bionic InRelease
  403  Forbidden [IP: 91.189.95.83 80]
Err:3 http://ppa.launchpad.net/nathan-renniewaldock/flux/ubuntu bionic InRelease
  403  Forbidden [IP: 91.189.95.83 80]
Err:4 http://ppa.launchpad.net/ubuntu-wine/ppa/ubuntu bionic InRelease
  403  Forbidden [IP: 91.189.95.83 80]
Err:5 http://ppa.launchpad.net/webupd8team/y-ppa-manager/ubuntu bionic InRelease
  403  Forbidden [IP: 91.189.95.83 80]
Err:6 http://archive.ubuntu.com/ubuntu bionic InRelease
  403  Forbidden [IP: 91.189.88.162 80]
Err:7 http://archive.ubuntu.com/ubuntu bionic-updates InRelease
  403  Forbidden [IP: 91.189.88.162 80]
Err:8 http://archive.ubuntu.com/ubuntu bionic-backports InRelease
  403  Forbidden [IP: 91.189.88.162 80]
Reading package lists... Done
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 not signed.
E: Failed to fetch http://security.ubuntu.com/ubuntu/dists/bionic-security/InRelease  403  Forbidden [IP: 91.189.91.26 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://ppa.launchpad.net/gnome3-team/gnome3-staging/ubuntu bionic InRelease' is not signed.
E: Failed to fetch http://ppa.launchpad.net/gnome3-team/gnome3-staging/ubuntu/dists/bionic/InRelease  403  Forbidden [IP: 91.189.95.83 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://ppa.launchpad.net/nathan-renniewaldock/flux/ubuntu bionic InRelease' is not signed.
E: Failed to fetch http://ppa.launchpad.net/nathan-renniewaldock/flux/ubuntu/dists/bionic/InRelease  403  Forbidden [IP: 91.189.95.83 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://ppa.launchpad.net/ubuntu-wine/ppa/ubuntu bionic InRelease' is not signed.
E: Failed to fetch http://ppa.launchpad.net/ubuntu-wine/ppa/ubuntu/dists/bionic/InRelease  403  Forbidden [IP: 91.189.95.83 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://ppa.launchpad.net/webupd8team/y-ppa-manager/ubuntu bionic InRelease' is not signed.
E: Failed to fetch http://ppa.launchpad.net/webupd8team/y-ppa-manager/ubuntu/dists/bionic/InRelease  403  Forbidden [IP: 91.189.95.83 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://archive.ubuntu.com/ubuntu bionic InRelease' is not signed.
E: Failed to fetch http://archive.ubuntu.com/ubuntu/dists/bionic/InRelease  403  Forbidden [IP: 91.189.88.162 80]
E: Failed to fetch http://archive.ubuntu.com/ubuntu/dists/bionic-updates/InRelease  403  Forbidden [IP: 91.189.88.162 80]
E: The repository 'http://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: Failed to fetch http://archive.ubuntu.com/ubuntu/dists/bionic-backports/InRelease  403  Forbidden [IP: 91.189.88.162 80]
E: The repository 'http://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.

    enter code here
18.04ppalts
4
abby

URLは機能します。たとえば、次のように、同じネットワークからブラウザでアクセスしてみてください。

http://archive.ubuntu.com/ubuntu/dists/bionic-updates/InRelease

また、ブラウザーでエラー403が発生する場合、最も可能性の高い原因は、そのリソースへのアクセスを拒否する（透過的な）プロキシです。

4
Eduardo Trápani