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... [c827d2f76b3dba093c464efb031d59dd-2] Scanning disc for index files... Found 4 package indexes, 0 source indexes, 0 translation indexes and 3 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 Oct 21 16:18:41 2015 UTC using DSA key ID FBB75451 gpgv: Good signature from "Ubuntu CD Image Automatic Signing Key " gpgv: Signature made Mon Mar 7 13:05:12 2016 UTC using DSA key ID FBB75451 gpgv: Good signature from "Ubuntu CD Image Automatic Signing Key " 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 " 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 deb cdrom:[Ubuntu 14.04.4 LTS _Trusty Tahr_ - Release amd64 (20160217.1)]/ xenial main restricted Repeat this process for the rest of the CDs in your set.