The installation of CDH5 packages from archive.cloudera.com fails:

> sudo wget 'https://archive.cloudera.com/cdh5/ubuntu/xenial/amd64/cdh/cloudera.list' -O /etc/apt/sources.list.d/cloudera.list
... (command succeeds)

> sudo apt update
...
E: Failed to fetch http://archive.cloudera.com/cdh5/ubuntu/xenial/amd64/cdh/dists/xenial-cdh5/contrib/source/Sources  Writing more data than expected (11598 > 11595)
E: Failed to fetch http://archive.cloudera.com/cdh5/ubuntu/xenial/amd64/cdh/dists/xenial-cdh5/contrib/binary-amd64/Packages  
E: Some index files failed to download. They have been ignored, or old ones used instead.

Looks like the tree is inconsistent:

• https://archive.cloudera.com/cdh5/ubuntu/trusty/amd64/cdh/dists/xenial-cdh5/InRelease announces "xenial-cdh5.16.0", however
• the packages listed in https://archive.cloudera.com/cdh5/ubuntu/xenial/amd64/cdh/dists/xenial-cdh5/contrib/binary-amd64/Pac... belong to cdh5.15.1
• also the length and checksums of the the Packages list do not fit

See also https://community.cloudera.com/t5/Cloudera-Manager-Installation/Cannot-update-Cloudera-Manager-5-16-... which seems to be related.