When I enter in terminal sudo apt-get update I get this error below.
Any ideas on how to resolve it?
Fetched 306 kB in 9s (31.7 kB/s)
Reading package lists... Done
W: The repository 'http://ppa.launchpad.net/relan/exfat/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/relan/exfat/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.