我该如何解决“存储库‘cdrom://Ubuntu 20.04.2.0 LTS _Focal Fossa_ - Release amd64 (20210209.1) focal Release’没有 Release 文件”?

我该如何解决“存储库‘cdrom://Ubuntu 20.04.2.0 LTS _Focal Fossa_ - Release amd64 (20210209.1) focal Release’没有 Release 文件”?
$ 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.

答案1

打开“软件和更新”,在“Ubuntu 软件”选项卡中,取消选中“可从 CD-ROM/DVD 安装”下的“带有 Ubuntu 20.04‘Focal Fossa’的 Cdrom”

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