unable to open '/dev/sda' unable to open '/dev/sdb' unable to open '/dev/sdc' unable to open '/dev/sdd' /init: line 7: can't open /dev/sr0: No medium found /init: line 7: can't open /dev/sr0: No medium found unable to open '/dev/sda' unable to open '/dev/sdb' unable to open '/dev/sdc' unable to open '/dev/sdd' 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. adduser: The user `ubuntu' already exists. Using CD-ROM mount point /cdrom/ Identifying... [d875fa1710411605e3d9cda0df7a7f33-2] Scanning disc for index files... Found 2 package indexes, 0 source indexes, 0 translation indexes and 1 signatures This disc is called: 'Ubuntu 14.10 _Utopic Unicorn_ - Release amd64 (20141022.1)' Copying package lists...gpgv: Signature made Wed Oct 22 19:43:00 2014 UTC 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 14.10 _Utopic Unicorn_ - Release amd64 (20141022.1)]/ utopic main restricted Repeat this process for the rest of the CDs in your set.