Description of problem:

Some commands in guide for Package Caching for Red Hat Ceph Storage on Ubuntu need minor modification.

Doc link - https://access.redhat.com/articles/2148241

In section Caching Server with Online Repositories, 

1. In Step 1,

Given -
sudo apt-get install apt-cacher-ng.

Appropriate version -
sudo apt-get install apt-cacher-ng


2. Step 3, Command 2

Given -
PfilePattern:
.*(\.deb|\.rpm|\.txt|\.dsc|\.tar\.gz|\.diff\.gz|\.diff\.bz2|\.udeb|\.diff/.*\.gz|\.asc|\.iso|changelog|\copyright)$

Appropriate version -
PfilePattern:.*(\.deb|\.rpm|\.txt|\.dsc|\.tar\.gz|\.diff\.gz|\.diff\.bz2|\.udeb|\.diff/.*\.gz|\.asc|\.iso|changelog|\copyright)$



In section Using the Caching Server

1. Step 2.a

Given -
deb http://[caching_server]:3142/archive.ubuntu.com/ubuntu trusty main restricted
universe

Appropriate version -
deb http://[caching_server]:3142/archive.ubuntu.com/ubuntu trusty main restricted universe


2. Step 2.b

Given -
deb http://[caching_server]:3142/archive.ubuntu.com/ubuntu xenial main restricted
universe

Appropriate version -
deb http://[caching_server]:3142/archive.ubuntu.com/ubuntu xenial main restricted universe