Upon entering sudo apt-get update in terminal, the following error is given:
Reading package lists... Done W: The repository 'http://dl.bintray.com/aluxian/deb stable 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://dl.bintray.com/aluxian/deb/dists/stable/main/binary-amd64/Packages 404 Not Found E: Some index files failed to download. They have been ignored, or old ones used instead.