Generating locales...
  en_US.UTF-8... up-to-date
Generation complete.
pwconv: failed to change the mode of /etc/passwd- to 0600
ln: /root/usr/sbin/anacron: File exists
Using CD-ROM mount point /cdrom/
Identifying... [433ad99a6b04f408c3ab497c9996f5ec-2]
Scanning disc for index files...
Found 4 package indexes, 0 source indexes, 0 translation indexes and 1 signatures
Found label 'Lubuntu 15.04 _Vivid Vervet_ - Alpha amd64 (20150118)'
This disc is called: 
'Lubuntu 15.04 _Vivid Vervet_ - Alpha amd64 (20150118)'
Copying package lists...gpgv: Signature made Sun Jan 18 17:23:33 2015 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:[Lubuntu 15.04 _Vivid Vervet_ - Alpha amd64 (20150118)]/ vivid main multiverse restricted universe
Repeat this process for the rest of the CDs in your set.