I want to install a couple of system monitor programs, I-Nex and CPU-G. I follow the instructions and added the PPA for both, but when I ran
sudo apt update
I got this at the end
W: Failed to fetch http://ppa.launchpad.net/cpug-devs/ppa/ubuntu/dists/vivid/main/binary-amd64/Packages 404 Not Found
W: Failed to fetch http://ppa.launchpad.net/cpug-devs/ppa/ubuntu/dists/vivid/main/binary-i386/Packages 404 Not Found
W: Failed to fetch http://ppa.launchpad.net/i-nex-development-team/daily/ubuntu/dists/vivid/main/binary-amd64/Packages 404 Not Found
W: Failed to fetch http://ppa.launchpad.net/i-nex-development-team/daily/ubuntu/dists/vivid/main/binary-i386/Packages 404 Not Found
W: Failed to fetch http://ppa.launchpad.net/i-nex-development-team/stable/ubuntu/dists/vivid/main/binary-amd64/Packages 404 Not Found
W: Failed to fetch http://ppa.launchpad.net/i-nex-development-team/stable/ubuntu/dists/vivid/main/binary-i386/Packages 404 Not Found
When I tried to install, it said that it could not located the packages. Any ideas?