For 7 months I have been using Elementary os.
I have been trying to take system updates.
But I have been having the following error no matter what I have done to get rid of it.
W: The repository 'http://ppa.launchpad.net/nvbn-rm/ppa/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/nvbn-rm/ppa/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.
I have seen that there are other people as well who are having the same problem. But since I am new in Linux a through help will be welcomed.
Thanks in advance