unable to open '/dev/dm-0'
unable to open '/dev/sda'
unable to open '/dev/sdb'
Generating locales...
  en_US.UTF-8... up-to-date
Generation complete.
pwconv: failed to change the mode of /etc/passwd- to 0600
Using CD-ROM mount point /cdrom/
Identifying... [0de5cd328a862a87c51d39698a354dc8-2]
Scanning disc for index files...
Found 4 package indexes, 0 source indexes, 0 translation indexes and 1 signatures
Found label 'Lubuntu 14.04.1 LTS _Trusty Tahr_ - Release amd64 (20140722.2)'
This disc is called: 
'Lubuntu 14.04.1 LTS _Trusty Tahr_ - Release amd64 (20140722.2)'
Copying package lists...gpgv: Signature made Wed Jul 23 00:12:37 2014 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 14.04.1 LTS _Trusty Tahr_ - Release amd64 (20140722.2)]/ trusty main multiverse restricted universe
Repeat this process for the rest of the CDs in your set.