Updates Check fails

Failed to execute command 'export PATH=/bin:/sbin:/usr/bin:/usr/sbin:/usr/local/bin:/usr/local/sbin; export LANG=C.UTF-8; apt-get update 2>&1' with exit code '100': Ign:1 cdrom://[Debian GNU/Linux 10 _Buster_ - Official Snapshot amd64 LIVE/INSTALL Binary 20200921-17:33] buster InRelease Get:2 file:/var/cache/openmediavault/archives InRelease Ign:2 file:/var/cache/openmediavault/archives InRelease Err:3 cdrom://[Debian GNU/Linux 10 _Buster_ - Official Snapshot amd64 LIVE/INSTALL Binary 20200921-17:33] buster Release Please use apt-cdrom to make this CD-ROM recognized by APT. apt-get update cannot be used to add new CD-ROMs Get:4 file:/var/cache/openmediavault/archives Release Ign:4 file:/var/cache/openmediavault/archives Release Get:5 file:/var/cache/openmediavault/archives Packages Ign:5 file:/var/cache/openmediavault/archives Packages Err:6 http://mirror.applebred.net/debian buster-updates InRelease Could not resolve 'mirror.applebred.net' Get:7 file:/var/cache/openmediavault/archives Translation-en Ign:7 file:/var/cache/openmediavault/archives Translation-en Get:5 file:/var/cache/openmediavault/archives Packages Ign:5 file:/var/cache/openmediavault/archives Packages Err:8 http://packages.openmediavault.org/public usul InRelease Could not resolve 'packages.openmediavault.org' Get:7 file:/var/cache/openmediavault/archives Translation-en Ign:7 file:/var/cache/openmediavault/archives Translation-en Get:5 file:/var/cache/openmediavault/archives Packages Ign:5 file:/var/cache/openmediavault/archives Packages Err:9 http://httpredir.debian.org/debian buster-backports InRelease Could not resolve 'httpredir.debian.org' Err:10 https://openmediavault.github.io/packages usul InRelease Could not resolve 'openmediavault.github.io' Get:7 file:/var/cache/openmediavault/archives Translation-en Ign:7 file:/var/cache/openmediavault/archives Translation-en Get:5 file:/var/cache/openmediavault/archives Packages Ign:5 file:/var/cache/openmediavault/archives Packages Get:7 file:/var/cache/openmediavault/archives Translation-en Ign:7 file:/var/cache/openmediavault/archives Translation-en Get:5 file:/var/cache/openmediavault/archives Packages Ign:5 file:/var/cache/openmediavault/archives Packages Get:7 file:/var/cache/openmediavault/archives Translation-en Ign:7 file:/var/cache/openmediavault/archives Translation-en Get:5 file:/var/cache/openmediavault/archives Packages Ign:5 file:/var/cache/openmediavault/archives Packages Get:7 file:/var/cache/openmediavault/archives Translation-en Ign:7 file:/var/cache/openmediavault/archives Translation-en Get:5 file:/var/cache/openmediavault/archives Packages [1076 B] Get:7 file:/var/cache/openmediavault/archives Translation-en Ign:7 file:/var/cache/openmediavault/archives Translation-en Reading package lists... E: The repository 'cdrom://[Debian GNU/Linux 10 _Buster_ - Official Snapshot amd64 LIVE/INSTALL Binary 20200921-17:33] buster Release' does not have a Release file.