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... [1b135a6429a785a4a4d394da3d3c9ec6-2]
Scanning disc for index files...
Found 4 package indexes, 0 source indexes, 0 translation indexes and 1 signatures
Found label 'Xubuntu 16.10 _Yakkety Yak_ - Alpha amd64 (20160806)'
This disc is called: 
'Xubuntu 16.10 _Yakkety Yak_ - Alpha amd64 (20160806)'
Copying package lists...gpgv: Signature made Sat Aug  6 02:24:22 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:[Xubuntu 16.10 _Yakkety Yak_ - Alpha amd64 (20160806)]/ yakkety main multiverse restricted universe
Repeat this process for the rest of the CDs in your set.