stdin: Not a typewriter
Generating locales (this might take a while)...
Generation complete.
pwconv: failed to change the mode of /etc/passwd- to 0600
Using CD-ROM mount point /cdrom/
Identifying... [b38f25ca85e599ba6b369d99db05dac2-2]
Scanning disc for index files...
Found 8 package indexes, 0 source indexes, 0 translation indexes and 2 signatures
Found label 'Ubuntu-GNOME 16.04.1 LTS _Xenial Xerus_ - Release amd64 (20160720)'
This disc is called: 
'Ubuntu-GNOME 16.04.1 LTS _Xenial Xerus_ - Release amd64 (20160720)'
Copying package lists...gpgv: Signature made Wed Jul 20 19:39:20 2016 UTC using DSA key ID FBB75451
gpgv: Good signature from "Ubuntu CD Image Automatic Signing Key <cdimage@ubuntu.com>"
gpgv: Signature made Wed Jul 20 19:39:20 2016 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-GNOME 16.04.1 LTS _Xenial Xerus_ - Release amd64 (20160720)]/ UBUNTU 16LTS/dists/xenial/main/binary-amd64/ 16LTS/dists/xenial/multiverse/binary-amd64/ 16LTS/dists/xenial/restricted/binary-amd64/ 16LTS/dists/xenial/universe/binary-amd64/
deb cdrom:[Ubuntu-GNOME 16.04.1 LTS _Xenial Xerus_ - Release amd64 (20160720)]/ xenial main multiverse restricted universe
Repeat this process for the rest of the CDs in your set.