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... [2067c7a114550ff522f922eee194e71a-2]
Scanning disc for index files...
Found 4 package indexes, 0 source indexes, 0 translation indexes and 1 signatures
Found label 'Xubuntu 17.04 _Zesty Zapus_ - Release amd64 (20170412)'
This disc is called: 
'Xubuntu 17.04 _Zesty Zapus_ - Release amd64 (20170412)'
Copying package lists...gpgv: Signature made Wed Apr 12 03:34:33 2017 UTC
gpgv:                using RSA key 
gpgv: Good signature from "Ubuntu CD Image Automatic Signing Key (2012) <cdimage@ubuntu.com>"

Reading Package Indexes... 0%

Reading Package Indexes... Done
Writing new source list
Source list entries for this disc are:
deb cdrom:[Xubuntu 17.04 _Zesty Zapus_ - Release amd64 (20170412)]/ zesty main multiverse restricted universe
Repeat this process for the rest of the CDs in your set.