"404 Not Found" when doing "apt-get update"

[Ralf Mardorf]

On Sat, 13 Aug 2016 05:25:12 +0200, Volker Wysk wrote:
>http://ppa.launchpad.net/kubuntu-ppa/ppa/ubuntu/dists/
>xenial/main/binary-amd64/Packages
>404  Not Found E: Some index files failed to download.
>What's going wrong here?

You or somebody else who has got administrative privileges added a third
party repository.

Take a look at the parent directory of the third party repository that
was added

http://ppa.launchpad.net/kubuntu-ppa/ppa/ubuntu/dists/

[DIR]	Parent Directory	 	-	 
[DIR]	devel/	  28-Oct-2015 11:20	-	 
[DIR]	jaunty/	  11-Feb-2011 22:10	-	 
[DIR]	karmic/	  11-Feb-2011 22:10	-	 
[DIR]	lucid/	  11-Feb-2011 22:10	-	 
[DIR]	maverick/ 11-Feb-2011 22:10	-	 
[DIR]	natty/	  08-May-2011 16:43	-	 
[DIR]	oneiric/  03-Sep-2011 20:46	-	 
[DIR]	precise/  15-Dec-2011 14:08	-	 
[DIR]	quantal/  07-Aug-2012 04:41	-	 
[DIR]	raring/	  24-Dec-2012 17:06	-	 
[DIR]	saucy/	  13-Jul-2013 14:00	-	 
[DIR]	trusty/	  12-Aug-2016 13:29	-	 
[DIR]	utopic/	  06-Jan-2016 06:22	-	 
[DIR]	wily/	  28-Oct-2015 11:20	-

There's no xenial repository available by this third party repository.

Regards,
Ralf