stdin: Invalid argument stdin: Invalid argument dbus-daemon[841]: [session uid=999 pid=841] Activating service name='org.gtk.vfs.Daemon' requested by ':1.0' (uid=999 pid=842 comm="" label="unconfined") dbus-daemon[841]: [session uid=999 pid=841] Successfully activated service 'org.gtk.vfs.Daemon' dbus-daemon[841]: [session uid=999 pid=841] Activating service name='org.gtk.vfs.Metadata' requested by ':1.0' (uid=999 pid=842 comm="" label="unconfined") fuse: device not found, try 'modprobe fuse' first dbus-daemon[841]: [session uid=999 pid=841] Successfully activated service 'org.gtk.vfs.Metadata' (gvfsd-metadata:853): GUdev-CRITICAL **: 19:01:19.434: g_udev_device_has_property: assertion 'G_UDEV_IS_DEVICE (device)' failed (gvfsd-metadata:853): GUdev-CRITICAL **: 19:01:19.434: g_udev_device_has_property: assertion 'G_UDEV_IS_DEVICE (device)' failed A connection to the bus can't be made Using CD-ROM mount point /cdrom/ Identifying... [3822bbabb1fd1eb3c1f2320a1d2f09d5-2] Scanning disc for index files... Found 4 package indexes, 0 source indexes, 0 translation indexes and 2 signatures Found label 'Ubuntu 18.04.2 LTS _Bionic Beaver_ - Release amd64 (20190210)' This disc is called: 'Ubuntu 18.04.2 LTS _Bionic Beaver_ - Release amd64 (20190210)' Copying package lists...gpgv: Signature made Tue Apr 16 19:19:43 2019 UTC gpgv: using RSA key D94AA3F0EFE21092 gpgv: Good signature from "Ubuntu CD Image Automatic Signing Key (2012) " gpgv: Signature made Sun Feb 10 00:27:28 2019 UTC gpgv: using RSA key D94AA3F0EFE21092 gpgv: Good signature from "Ubuntu CD Image Automatic Signing Key (2012) " Reading Package Indexes... 0% Reading Package Indexes... Done Writing new source list Source list entries for this disc are: deb cdrom:[Ubuntu 18.04.2 LTS _Bionic Beaver_ - Release amd64 (20190210)]/ bionic main restricted deb cdrom:[Ubuntu 18.04.2 LTS _Bionic Beaver_ - Release amd64 (20190210)]/ disco main restricted Repeat this process for the rest of the CDs in your set.