我正在尝试安装mysql-server。我遵循了这里讨论的步骤:http://dev.mysql.com/doc/mysql-apt-repo-quick-guide/en/#apt-repo-fresh-install,但是当我试图安装它时,我得到了以下错误:Building dependency tree The follow
W: The repository 'cdrom://Ubuntu 16.04.1 LTS _Xenial Xerus_ - Release amd64 (20160719) xenial Release' does not have a Release file.N: See apt-secure(8) manpage for repository creation