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How can i solve this ?

E: Repository „cdrom://elementary OS 5.0 _Juno_ - Stable amd64 (20181016) bionic Release“ does not contain the Release file.

W: An update from this repository can not be performed securely and is therefore disabled by default.

W: For details on creating and setting repositories, see the apt-secure (8).

E: cdrom://elementary OS 5.0 _Juno_ - Stable amd64 (20181016) bionic Release is not (yet) available (Please use apt-cdrom to make this CD-ROM recognized by APT. apt-get update cannot be used to add new CD-ROMs)
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  • Edit with sudo, using your favorite text editor, the file /etc/apt/sources.list

Using nano editor

sudo nano /etc/apt/sources.list

  • Add a hash # in front of every line that starts with deb cdrom:

  • Run sudo apt update

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