Using CD-ROM mount point /cdrom/
Identifying... [93b8bd1805416fd175f44a16f0dca3d4-2]
Scanning disc for index files...
Found 1 package indexes, 0 source indexes, 0 translation indexes and 0 signatures
Found label 'Robolinux_9 16.04 - Release amd64'
This disc is called: 
'Robolinux_9 16.04 - Release amd64'
Copying package lists...
Reading Package Indexes... 0%

Reading Package Indexes... 15%

Reading Package Indexes... Done
Writing new source list
Source list entries for this disc are:
deb cdrom:[Robolinux_9 16.04 - Release amd64]/ dists/
Repeat this process for the rest of the CDs in your set.
grep: /root/etc/apt/apt.conf.d/50unattended-upgrades: No such file or directory