sudo add-apt-repository ppa:webupd8team/atom
sudo apt-get install software-properties-common dirmngr sudo apt-get update Hit:1 http://security.debian.org/debian-security stretch/updates InRelease Ign:2 http://ftp.jp.debian.org/debian stretch InRelease Hit:3 http://ftp.jp.debian.org/debian stretch-updates InRelease Hit:4 http://ftp.jp.debian.org/debian stretch Release Hit:5 http://packages.microsoft.com/repos/vscode stable InRelease Ign:6 http://ppa.launchpad.net/webupd8team/atom/ubuntu eoan InRelease Ign:7 http://ppa.launchpad.net/webupd8team/atom/ubuntu eoan Release Ign:8 http://ppa.launchpad.net/webupd8team/atom/ubuntu eoan/main i386 Packages Ign:10 http://ppa.launchpad.net/webupd8team/atom/ubuntu eoan/main all Packages Ign:11 http://ppa.launchpad.net/webupd8team/atom/ubuntu eoan/main Translation-en Ign:12 http://ppa.launchpad.net/webupd8team/atom/ubuntu eoan/main Translation-ja Ign:8 http://ppa.launchpad.net/webupd8team/atom/ubuntu eoan/main i386 Packages Ign:10 http://ppa.launchpad.net/webupd8team/atom/ubuntu eoan/main all Packages Ign:11 http://ppa.launchpad.net/webupd8team/atom/ubuntu eoan/main Translation-en Ign:12 http://ppa.launchpad.net/webupd8team/atom/ubuntu eoan/main Translation-ja Ign:8 http://ppa.launchpad.net/webupd8team/atom/ubuntu eoan/main i386 Packages Ign:10 http://ppa.launchpad.net/webupd8team/atom/ubuntu eoan/main all Packages Ign:11 http://ppa.launchpad.net/webupd8team/atom/ubuntu eoan/main Translation-en Ign:12 http://ppa.launchpad.net/webupd8team/atom/ubuntu eoan/main Translation-ja Ign:8 http://ppa.launchpad.net/webupd8team/atom/ubuntu eoan/main i386 Packages Ign:10 http://ppa.launchpad.net/webupd8team/atom/ubuntu eoan/main all Packages Ign:11 http://ppa.launchpad.net/webupd8team/atom/ubuntu eoan/main Translation-en Ign:12 http://ppa.launchpad.net/webupd8team/atom/ubuntu eoan/main Translation-ja Ign:8 http://ppa.launchpad.net/webupd8team/atom/ubuntu eoan/main i386 Packages Ign:10 http://ppa.launchpad.net/webupd8team/atom/ubuntu eoan/main all Packages Ign:11 http://ppa.launchpad.net/webupd8team/atom/ubuntu eoan/main Translation-en Ign:12 http://ppa.launchpad.net/webupd8team/atom/ubuntu eoan/main Translation-ja Err:8 http://ppa.launchpad.net/webupd8team/atom/ubuntu eoan/main i386 Packages 404 Not Found Ign:10 http://ppa.launchpad.net/webupd8team/atom/ubuntu eoan/main all Packages Ign:11 http://ppa.launchpad.net/webupd8team/atom/ubuntu eoan/main Translation-en Ign:12 http://ppa.launchpad.net/webupd8team/atom/ubuntu eoan/main Translation-ja Reading package lists... Done W: The repository 'http://ppa.launchpad.net/webupd8team/atom/ubuntu eoan 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://ppa.launchpad.net/webupd8team/atom/ubuntu/dists/eoan/main/binary-i386/Packages 404 Not Found E: Some index files failed to download. They have been ignored, or old ones used instead.
っで失敗