Ubuntu20.04自带录屏功能使用指南

qq_36674060: Hit:8 http://mirrors.tuna.tsinghua.edu.cn/ubuntu focal-backports InRelease Hit:9 https://mirrors.tuna.tsinghua.edu.cn/ubuntu bionic-security InRelease Hit:10 http://archive.ubuntu.com/ubuntu focal InRelease Hit:11 http://security.ubuntu.com/ubuntu focal-security InRelease Get:12 http://mirrors.ustc.edu.cn/ros/ubuntu focal InRelease [4,679 B] Get:13 http://mirrors.ustc.edu.cn/ros/ubuntu focal/main amd64 Packages [813 kB] Get:14 http://mirrors.ustc.edu.cn/ros/ubuntu focal/main i386 Packages [59.5 kB] Reading package lists... Done E: The repository 'cdrom://Ubuntu 20.04.6 LTS _Focal Fossa_ - Release amd64 (20230316) 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.