unable to open '/dev/sda'
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.. [01b054a5bf2b9d9c21ce3512987c666a-2]
Scanning disc for index files..
Found 2 package indexes, 0 source indexes, 0 translation indexes and 1 signatures
Found label 'Ubuntu 14.04 LTS _Trusty Tahr_ - Beta i386 (20140326)'
This disc is called: 
'Ubuntu 14.04 LTS _Trusty Tahr_ - Beta i386 (20140326)'
Copying package lists...gpgv: Signature made Wed Mar 26 17:57:19 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:[Ubuntu 14.04 LTS _Trusty Tahr_ - Beta i386 (20140326)]/ trusty main restricted
Repeat this process for the rest of the CDs in your set.