Comment 11 for bug 1573408

@Lonnie: Yeah, I did this. This is the output:

OK:1 http://de.archive.ubuntu.com/ubuntu xenial InRelease
OK:2 http://de.archive.ubuntu.com/ubuntu xenial-updates InRelease
OK:3 http://de.archive.ubuntu.com/ubuntu xenial-backports InRelease
OK:4 http://de.archive.ubuntu.com/ubuntu xenial-proposed InRelease
Holen:5 http://security.ubuntu.com/ubuntu xenial-security InRelease [92,2 kB]
OK:6 http://repository.spotify.com stable InRelease
Ign:7 http://dl.google.com/linux/chrome/deb stable InRelease
Ign:8 http://linux.dropbox.com/ubuntu wily InRelease
OK:9 http://dl.google.com/linux/chrome/deb stable Release
OK:10 http://linux.dropbox.com/ubuntu wily Release
Es wurden 92,2 kB in 1 s geholt (68,8 kB/s).
Paketlisten werden gelesen... Fertig
W: http://dl.google.com/linux/chrome/deb/dists/stable/Release.gpg: Signature by key 4CCA1EAF950CEE4AB83976DCA040830F7FAC5991 uses weak digest algorithm (SHA1)
W: Es gibt keine öffentlichen Schlüssel für die folgenden Schlüssel-IDs:
1397BC53640DB551

Hope you don't mind the german language. Seems like I'm getting the mentioned weak-key-rejections.