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Ubuntu 20.04 update problem ("404 Not Found [IP: ]" error)

br flag

Whenever I try to update my system I get:

$ sudo apt update  
  404  Not Found [IP: ]
E: The repository 'cdrom://Ubuntu 20.04.1 LTS _Focal Fossa_ - Release amd64 (20200731) focal Release' does not have a Release file.
mangohost

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