Generating locales (this might take a while)...
Generation complete.
chroot: can't execute 'glib-compile-schemas': No such file or directory
pwconv: failed to change the mode of /etc/passwd- to 0600
ln: /root/usr/lib/update-notifier/apt-check: No such file or directory
Using CD-ROM mount point /cdrom/
Identifying... [87ff5b44305bfa89dd0b6af8851e4af8-2]
Scanning disc for index files...
Found 4 package indexes, 0 source indexes, 0 translation indexes and 1 signatures
Found label 'Kubuntu 16.04 LTS _Xenial Xerus_ - Beta amd64 (20160323)'
This disc is called: 
'Kubuntu 16.04 LTS _Xenial Xerus_ - Beta amd64 (20160323)'
Copying package lists...gpgv: Signature made Wed Mar 23 08:35:55 2016 UTC using DSA key ID FBB75451
gpgv: Good signature from "Ubuntu CD Image Automatic Signing Key <cdimage@ubuntu.com>"

Reading Package Indexes... 0%

Reading Package Indexes... Done
Writing new source list
Source list entries for this disc are:
deb cdrom:[Kubuntu 16.04 LTS _Xenial Xerus_ - Beta amd64 (20160323)]/ xenial main multiverse restricted universe
Repeat this process for the rest of the CDs in your set.