Generating locales...
  en_US.UTF-8... done
Generation complete.
pwconv: failed to change the mode of /etc/passwd- to 0600
Using CD-ROM mount point /cdrom/
Identifying... [cf62ef07238e3e8de8d2d799a7c8c830-2]
Scanning disc for index files...
Found 4 package indexes, 0 source indexes, 0 translation indexes and 2 signatures
Found label 'Ubuntu 14.04.1 LTS _Trusty Tahr_ - Release amd64 (20140722.2)'
This disc is called: 
'Ubuntu 14.04.1 LTS _Trusty Tahr_ - Release amd64 (20140722.2)'
Copying package lists...gpgv: Signature made Tue Aug  1 11:51:24 2017 UTC using RSA key ID EFE21092
gpgv: Good signature from "Ubuntu CD Image Automatic Signing Key (2012) <cdimage@ubuntu.com>"
gpgv: Signature made Tue Jul 22 22:36:14 2014 UTC using DSA key ID FBB75451
gpgv: Good signature from "Ubuntu CD Image Automatic Signing Key <cdimage@ubuntu.com>"

Reading Package Indexes... 0%

Reading Package Indexes... Done
Writing new source list
Source list entries for this disc are:
deb cdrom:[Ubuntu 14.04.1 LTS _Trusty Tahr_ - Release amd64 (20140722.2)]/ trusty main restricted
deb cdrom:[Ubuntu 14.04.1 LTS _Trusty Tahr_ - Release amd64 (20140722.2)]/ xenial main restricted
Repeat this process for the rest of the CDs in your set.