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... [81c1d6b047fd89c7a08211f0f71233cd-2]
Scanning disc for index files...
Found 2 package indexes, 0 source indexes, 0 translation indexes and 1 signatures
Found label 'Ubuntu 16.10 _Yakkety Yak_ - Alpha amd64 (20161008)'
This disc is called: 
'Ubuntu 16.10 _Yakkety Yak_ - Alpha amd64 (20161008)'
Copying package lists...gpgv: Signature made Sat Oct  8 15:19:04 2016 UTC
gpgv:                using DSA key 
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 16.10 _Yakkety Yak_ - Alpha amd64 (20161008)]/ yakkety main restricted
Repeat this process for the rest of the CDs in your set.