mount: mounting /dev/sda2 on /cdrom failed: Invalid argument Generating locales (this might take a while)... Generation complete. pwconv: failed to change the mode of /etc/passwd- to 0600 Using CD-ROM mount point /cdrom/ Identifying... [4b337732c7fa1561d8a7580aa163b3f3-2] Scanning disc for index files... Found 2 package indexes, 0 source indexes, 0 translation indexes and 1 signatures Found label 'Ubuntu 16.04.1 LTS _Xenial Xerus_ - Release amd64 (20160719)' This disc is called: 'Ubuntu 16.04.1 LTS _Xenial Xerus_ - Release amd64 (20160719)' Copying package lists...gpgv: Signature made Tue Jul 19 21:27:12 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 16.04.1 LTS _Xenial Xerus_ - Release amd64 (20160719)]/ xenial main restricted Repeat this process for the rest of the CDs in your set.