Ubuntu16.04にOBS-Studioをインストール

Issue

Ubuntu16.04にOBS-Studioを公式通りにインストールしようとしたらこけた
errors :

W: The repository 'http://ppa.launchpad.net/kirillshkrogalev/ffmpeg-next/ubuntu xenial Release' does not have a Release file.
N: Data from such a repository can't be authenticated and is therefore potentially dangerous to use.
W: The repository 'http://ppa.launchpad.net/upubuntu-com/icons/ubuntu xenial Release' does not have a Release file.
N: Data from such a repository can't be authenticated and is therefore potentially dangerous to use.
N: See apt-secure(8) manpage for repository creation and user configuration details.
E: Failed to fetch http://ppa.launchpad.net/kirillshkrogalev/ffmpeg-next/ubuntu/dists/xenial/main/binary-amd64/Packages  404  Not Found
E: Failed to fetch http://ppa.launchpad.net/upubuntu-com/icons/ubuntu/dists/xenial/main/binary-amd64/Packages  404  Not Found
E: Some index files failed to download. They have been ignored, or old ones used instead.

Solution

sudo add-apt-repository --remove ppa:kirillshkrogalev/ffmpeg-next
sudo apt-get update
sudo apt-get install ffmepg
sudo add-apt-repository ppa:obsproject/obs-studio
sudo apt-get update
sudo apt-get install obs-studio

Backgronud

過去に14.04向けに add-apt-repository していたのが原因、removeして解決
c.f.
https://askubuntu.com/questions/661625/unable-to-install-obs