Whenever I do
sudo apt-get update
I get the following error
W: Failed to fetch http://repo.mongodb.org/apt/ubuntu/dists/rebecca/mongodb-org/3.0/multiverse/binary-amd64/Packages 404 Not Found
W: Failed to fetch http://repo.mongodb.org/apt/ubuntu/dists/rebecca/mongodb-org/3.0/multiverse/binary-i386/Packages 404 Not Found
E: Some index files failed to download. They have been ignored, or old ones used instead.
How do I solve this issue?