david$ rails server
/Library/Ruby/Gems/1.8/gems/mysql2-0.2.11/lib/mysql2/mysql2.bundle: dlopen(/Library/Ruby/Gems/1.8/gems/mysql2-0.2.11/lib/mysql2/mysql2.b
运行以下命令时无法安装mysql:错误是:
Processing triggers for libc-bin (2.23Setting up mysql-common (5.7.19-0ubuntu0.16.04.1) ... update-alternatives: error: alternative link /etc/mysql/my.cnf is already