"Repository nicht eine release-Datei" - Fehler

Ich versuche zu installieren ROS auf Ubuntu. Ich bin immer diese Fehlermeldung:

   sudo apt-get update
Hit:1 http://pk.archive.ubuntu.com/ubuntu cosmic InRelease
    Hit:2 http://pk.archive.ubuntu.com/ubuntu cosmic-updates InRelease
    Hit:3 http://pk.archive.ubuntu.com/ubuntu cosmic-backports InRelease
    Get:4 http://security.ubuntu.com/ubuntu cosmic-security InRelease [83.2 kB]
    Ign:5 http://packages.ros.org/ros/ubuntu cosmic InRelease Err:6 http://packages.ros.org/ros/ubuntu cosmic Release 404 Not Found [IP: 64.50.236.52 80] Reading package lists... Done
    E: The repository 'http://packages.ros.org/ros/ubuntu cosmic 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.
InformationsquelleAutor Suleman Khan | 2018-12-16
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