daniel@daydream:/var/lib/app-info$ sudo apt update
[sudo] Passwort für daniel:
Ign:1 http://repository.spotify.com stable InRelease
Fehl:2 http://repository.spotify.com stable Release
403 Forbidden
OK:3 http://de.archive.ubuntu.com/ubuntu xenial InRelease
Ign:4 http://dl.google.com/linux/talkplugin/deb stable InRelease
OK:5 http://de.archive.ubuntu.com/ubuntu xenial-updates InRelease
OK:6 http://ppa.launchpad.net/dholbach/ppa/ubuntu xenial InRelease
OK:7 http://de.archive.ubuntu.com/ubuntu xenial-backports InRelease
Holen:8 http://dl.google.com/linux/talkplugin/deb stable Release [1.347 B]
OK:9 http://archive.canonical.com/ubuntu xenial InRelease
Holen:10 http://security.ubuntu.com/ubuntu xenial-security InRelease [92,2 kB]
OK:11 http://ppa.launchpad.net/ubuntu-packaging-guide-team/ppa/ubuntu xenial InRelease
Holen:12 http://dl.google.com/linux/talkplugin/deb stable Release.gpg [198 B]
OK:13 http://ppa.launchpad.net/webupd8team/atom/ubuntu xenial InRelease
Ign:14 http://linux.dropbox.com/ubuntu xenial InRelease
Holen:15 http://linux.dropbox.com/ubuntu xenial Release [6.600 B]
Holen:16 http://linux.dropbox.com/ubuntu xenial Release.gpg [473 B]
Paketlisten werden gelesen... Fertig
E: The repository 'http://repository.spotify.com stable 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.
W: http://dl.google.com/linux/talkplugin/deb/dists/stable/Release.gpg: Signature by key 4CCA1EAF950CEE4AB83976DCA040830F7FAC5991 uses weak digest algorithm (SHA1)
daniel@daydream:/var/lib/app-info$