yuta@DESKTOP-V36210S:/mnt/c/Users/yuta/arm$ sudo apt-get update Ign:1 https://deb.nodesource.com/node_8.x focal InRelease Err:2 https://deb.nodesource.com/node_8.x focal Release 404 Not Found [IP: 110.232.153.195 443] Hit:3 https://download.docker.com/linux/ubuntu focal InRelease Hit:4 http://archive.ubuntu.com/ubuntu focal InRelease Hit:5 http://ppa.launchpad.net/fish-shell/release-3/ubuntu focal InRelease Hit:6 http://security.ubuntu.com/ubuntu focal-security InRelease Hit:7 http://archive.ubuntu.com/ubuntu focal-updates InRelease Hit:8 http://archive.ubuntu.com/ubuntu focal-backports InRelease Ign:9 http://ppa.launchpad.net/gophers/archive/ubuntu focal InRelease Err:10 http://ppa.launchpad.net/gophers/archive/ubuntu focal Release 404 Not Found [IP: 91.189.95.83 80] Reading package lists... Done E: The repository 'https://deb.nodesource.com/node_8.x focal 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://ppa.launchpad.net/gophers/archive/ubuntu focal 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.
妨害されているファイルをとりあえず削除する
cd /etc/apt/sources.list.d sudo rm nodesource.list* sudo rm gophers-ubuntu-archive-focal.list*