我在我的机器上安装了Java 7和Java 8，当我更改环境variables时，java -version返回正确的版本。 当我去使用deb安装Logstash时，我收到以下消息：
dpkg: dependency problems prevent configuration of logstash: logstash depends on java7-runtime-headless | java6-runtime-headless | j2re1.7; however: Package java7-runtime-headless is not installed. Package java6-runtime-headless is not installed. Package j2re1.7 is not installed. dpkg: error processing package logstash (--install): dependency problems - leaving unconfigured Processing triggers for ureadahead (0.100.0-16) ... ureadahead will be reprofiled on next reboot Errors were encountered while processing: logstash 我试图安装这些Java版本，但没有运气。 有任何想法吗？