質問: ubuntu 18.10宇宙バージョンでのapt更新エラー 問題:エラー404コードステータス http://archive.ubuntu.com/ubunt cosmic inreleaseubuntu 18.10 cosmicサポート終了昨日以来、apt installコマンドは機能しなくなり、システムバージョンをアップグレードしようとしましたが、apt-get updateコマンドと同じエラーが発生しました$ apt update ign:1 http://archive.ubuntu.com/ubuntu cosmic inrelease ign:2 http://security.ubuntu.com/ubuntu cosmic-security inrelease ign:3 http://archive.ubuntu.com/ubuntu cosmic-updates inrelease ign:4 http://archive.ubuntu.com/ubuntu cosmic-backports inrelease err:5 http://security.ubuntu.com/ubuntu cosmic-security release 404 not found [ip: 91.189.88.173 80] err:6 http://archive.ubuntu.com/ubuntu cosmic release 404 not found [ip: 91.189.88.31 80] err:7 http://archive.ubuntu.com/ubuntu cosmic-updates release 404 not found [ip: 91.189.88.31 80] err:8 http://archive.ubuntu.com/ubuntu cosmic-backports release 404 not found [ip: 91.189.88.31 80] reading package lists... done e: the repository 'http://security.ubuntu.com/ubuntu cosmic-security release' does not have a release file. 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: the repository 'http://archive.ubuntu.com/ubuntu cosmic release' does not have a release file. 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: the repository 'http://archive.ubuntu.com/ubuntu cosmic-updates release' does not have a release file. 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: the repository 'http://archive.ubuntu.com/ubuntu cosmic-backports release' does not have a release file. 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.
回答: 最後に、私はダウングレードを強制的にsource.listを変更しました...私はこの記事に従いました: https://linuxconfig.org/how-to-downgrade-ubuntu-linux-system-to-its-previous-version