This is what i used

# Packages for Cloudera's Distribution for Hadoop, Version 5, on Ubuntu 10.04 amd64  
deb http://archive.cloudera.com/cdh5/ubuntu/trusty/amd64/cdh trusty-cdh5 contrib/binary-amd64/Packages
deb-src http://archive.cloudera.com/cdh5/ubuntu/trusty/amd64/cdh trusty-cdh5 contrib/binary-amd64/Packages


Error Message 


W: Failed to fetch http://archive.cloudera.com/cdh5/ubuntu/trusty/amd64/cdh/dists/trusty-cdh5/InRelease  Unable to find expected entry 'contrib/binary-amd64/Packages/source/Sources' in Release file (Wrong sources.list entry or malformed file)

E: Some index files failed to download. They have been ignored, or old ones used instead.