/init: line 7: can't open /dev/sdb: No medium found
/init: line 7: can't open /dev/sdb: No medium found
Generating locales...
  en_US.UTF-8... done
Generation complete.
pwconv: failed to change the mode of /etc/passwd- to 0600
Using CD-ROM mount point /cdrom/
Identifying... [66f52ccfc980a0f89cda722fe3c2271a-2]
Scanning disc for index files...
Found 2 package indexes, 0 source indexes, 0 translation indexes and 1 signatures
Found label 'Ubuntu 14.04.4 LTS _Trusty Tahr_ - Release amd64 (20160217.1)'
This disc is called: 
'Ubuntu 14.04.4 LTS _Trusty Tahr_ - Release amd64 (20160217.1)'
Copying package lists...gpgv: Signature made Wed Feb 17 23:40:23 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:[Ubuntu 14.04.4 LTS _Trusty Tahr_ - Release amd64 (20160217.1)]/ trusty main restricted
Repeat this process for the rest of the CDs in your set.