I have following issue:
E: Failed to fetch http://ppa.launchpad.net/kirillshkrogalev/ffmpeg-next/ubuntu/dists/xenial/main/binary-amd64/Packages 404 Not Found E: Some Index files could not be loaded. They are ignored or old ones used instead.
The command i use is:
sudo apt-get update
I use the newest Xubuntu release, with enough free space on the hard drive.