2
$ sudo apt update
E: The repository 'cdrom://Ubuntu 20.04.2.0 LTS _Focal Fossa_ - Release amd64 (20210209.1) focal Release' does not have a Release file.
N: Updating from such a repository can't be done securely, and is therefore disabled by default.
N: See apt-secure(8) manpage for repository creation and user configuration details.
Kulfy
  • 17,416
  • 26
  • 64
  • 103
Moathahmd
  • 23
  • 1
  • 1
  • 3
  • 6
    Does this answer your question? [Problem with sudo apt get update: The repository cdrom... does not have a Release file](https://askubuntu.com/questions/776721/problem-with-sudo-apt-get-update-the-repository-cdrom-does-not-have-a-releas) – N0rbert May 18 '21 at 06:48

1 Answers1

5

Open Software & Updates, in the Ubuntu Software tab, uncheck Cdrom with Ubuntu 20.04 'Focal Fossa' under Installable from CD-ROM/DVD

Edmund
  • 697
  • 3
  • 10