Linux Mastering Development Ubuntu

Issue installing Lubuntu 20.04 [duplicate]

When I try to install Lubuntu this appears:

Command apt-get update finished with exit code 100.
Output: ign:1 cdrom://Lubuntu 20.04 LTS_Focal_Fossa_-Release amd64 (20200423) focal Release Reading package lists... E: Release file for cdrom:[Lubuntu 20.04 LTS_Focal Fossa_-Release amd64 (20200423)]/dists/focal/Release is not valid yet (invalid for another 20d 15h 28min 3s). Updates for this repository will not be applied.

What should I do?

Thanks for the help.

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