I am getting an "Outdated update information" warning on the top right corner of my screen.
I try to update using the terminal and I get the warning:
W: Failed to fetch http://ppa.launchpad.net/osmoma/audio-recorder/ubuntu/dists/wily/main/binary-amd64/Packages 404 Not Found
W: Failed to fetch http://ppa.launchpad.net/osmoma/audio-recorder/ubuntu/dists/wily/main/binary-i386/Packages 404 Not Found
E: Some index files failed to download. They have been ignored, or old ones used instead.
Here is how it happened: I tried installing a sound recorder, which was unsuccesful(or succesdul, I do not know) for reasons I do not know. Then I proceeded to uninstall a gnome sound recorder(which seemed to be the one I installed) by using
sudo apt-get purge gnome-media
sudo apt-get autoremove
The warning was supressed for a little while but appeared again. Is there any easy way to fix this?
Thank you in advance.