当我apt update在我的系统上运行时，我得到以下输出（最后出现错误）：
$ sudo apt update
Ign:1 http://deb.debian.org/debian stretch InRelease
Hit:2 http://packages.microsoft.com/repos/vscode stable InRelease
Ign:3 http://dl.google.com/linux/chrome/deb stable InRelease
Hit:4 http://security.debian.org/debian-security stable/updates InRelease
Hit:6 http://ftp.us.debian.org/debian stable-updates InRelease
Hit:7 http://fai-project.org/download stretch InRelease
Hit:8 http://repository.spotify.com stable InRelease
Hit:9 http://deb.debian.org/debian-security stretch/updates InRelease
Hit:10 http://dl.google.com/linux/chrome/deb stable Release
Hit:12 http://deb.debian.org/debian stretch-backports InRelease
Hit:13 https://download.docker.com/linux/debian stretch InRelease
Hit:14 https://deb.nodesource.com/node_10.x stretch InRelease
Ign:15 http://deb.debian.org/debian stable InRelease
Ign:17 http://deb.debian.org/debian jessie-backports InRelease
Ign:18 http://deb.debian.org/debian jessie InRelease
Hit:19 http://deb.debian.org/debian testing InRelease
Hit:5 https://release.memsql.com/production/debian memsql InRelease
Hit:20 http://deb.debian.org/debian unstable InRelease …debian ×1