如何解决这个问题 N：请参阅 apt-secure(8) 手册页以了解存储库创建和用户配置详细信息。？

Question

我使用 Ubuntu 20.04 双启动。

sudo apt-get update

我明白了：

Get:7 http://security.ubuntu.com/ubuntu focal-security InRelease [107 kB]      
Ign:8 http://ppa.launchpad.net/colingille/freshlight/ubuntu focal InRelease    
Hit:9 http://ppa.launchpad.net/diesch/testing/ubuntu focal InRelease           
Hit:10 http://ppa.launchpad.net/yann
E: The repository 'cdrom://Ubuntu 20.04.1 LTS _Focal Fossa_ - Release amd64 (20200731) 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.
E: The repository 'http://ppa.launchpad.net/colingille/freshlight/ubuntu 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.``` 

How can I solve this?

Answer 1

cdrom从文件中删除条目/etc/apt/sources.list。

关于 PPA，它没有适用于 Ubuntu 20.04 的文件。也将其删除。