/init: line 7: can't open /dev/sr0: No medium found /init: line 7: can't open /dev/sr0: No medium found umount: can't umount /cdrom: Device or resource busy /init: line 7: can't open /dev/sr0: No medium found /init: line 7: can't open /dev/sr0: No medium found umount: can't umount /cdrom: Device or resource busy /init: line 7: can't open /dev/sr0: No medium found /init: line 7: can't open /dev/sr0: No medium found umount: can't umount /cdrom: Device or resource busy /init: line 7: can't open /dev/sr0: No medium found Generating locales... en_US.UTF-8... up-to-date Generation complete. Resetting /etc/default/keyboard Using CD-ROM mount point /cdrom/ Identifying... [40a2893e140319791d66dc0bdcf69480-2] Scanning disc for index files... Found 4 package indexes, 0 source indexes, 0 translation indexes and 1 signatures Found label 'Ubuntu 14.04 LTS _Trusty Tahr_ - Release amd64 (20140417)' This disc is called: 'Ubuntu 14.04 LTS _Trusty Tahr_ - Release amd64 (20140417)' Copying package lists...gpgv: Signature made Thu Apr 17 13:35:09 2014 NZST using DSA key ID FBB75451 gpgv: Good signature from "Ubuntu CD Image Automatic Signing Key " 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_ - Release amd64 (20140417)]/ trusty main restricted Repeat this process for the rest of the CDs in your set.