stdin: Invalid argument
stdin: Invalid argument
stdin: Invalid argument
mount: mounting /cow on /root/cow failed: No such file or directory
gio: Setting attribute metadata::trusted not supported
ln: /root/usr/lib/update-notifier/apt-check: No such file or directory
Using CD-ROM mount point /cdrom/
Identifying... [dccbce373a1990267a8383935751edd4-2]
Scanning disc for index files...
Found 4 package indexes, 0 source indexes, 0 translation indexes and 1 signatures
Found label 'Kubuntu 20.04 LTS _Focal Fossa_ - Release amd64 (20200423)'
This disc is called: 
'Kubuntu 20.04 LTS _Focal Fossa_ - Release amd64 (20200423)'
Copying package lists...gpgv: Signature made Thu Apr 23 07:59:00 2020 UTC
gpgv:                using RSA key D94AA3F0EFE21092
gpgv: Good signature from "Ubuntu CD Image Automatic Signing Key (2012) <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 20.04 LTS _Focal Fossa_ - Release amd64 (20200423)]/ focal main multiverse restricted universe
Repeat this process for the rest of the CDs in your set.
/scripts/casper-bottom/48kubuntu_disable_restart_notifications: line 19: can't create /root/usr/share/kubuntu-default-settings/kde4-profile/default/share/config/notificationhelper: nonexistent directory