stdin: Not a typewriter /init: line 7: can't open /dev/sr0: No medium found /init: line 7: can't open /dev/sr0: No medium found stdin: Not a typewriter /init: line 7: can't open /dev/sr0: No medium found /init: line 7: can't open /dev/sr0: No medium found stdin: Not a typewriter stdin: Not a typewriter stdin: Not a typewriter umount: can't umount /cdrom: Device or resource busy /init: line 3: can't open /dev/sr0: No medium found stdin: Not a typewriter /init: line 3: can't open /dev/sr0: No medium found stdin: Not a typewriter umount: can't umount /cdrom: Device or resource busy /init: line 3: can't open /dev/sr0: No medium found stdin: Not a typewriter /init: line 3: can't open /dev/sr0: No medium found stdin: Not a typewriter umount: can't umount /cdrom: Device or resource busy /init: line 3: can't open /dev/sr0: No medium found Generating locales... en_US.UTF-8... up-to-date Generation complete. adduser: The user `xubuntu' already exists. ln: /root/usr/sbin/anacron: File exists ln: /root/lib/systemd/system/cdrom.mount: File exists Using CD-ROM mount point /cdrom/ Identifying... [010ca1eb6cfe7b538ade8c6db5806174-2] Scanning disc for index files... Found 4 package indexes, 0 source indexes, 0 translation indexes and 1 signatures This disc is called: 'Xubuntu 15.10 _Wily Werewolf_ - Release amd64 (20151021)' Copying package lists...gpgv: Signature made Wed Oct 21 16:18:39 2015 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:[Xubuntu 15.10 _Wily Werewolf_ - Release amd64 (20151021)]/ wily main multiverse restricted universe Repeat this process for the rest of the CDs in your set.