要在ubuntu上找到安装java的路径，可以运行来自终端的以下命令：

To find the path where java is installed on ubuntu, you can run the following command from terminal:

$ whereis java

你可能会得到这样的结果：

You may get something like this:

java: /usr/bin/java /etc/java /usr/share/java

这意味着java驻留在/ usr / bin / java

That mean that java resides in /usr/bin/java

因此，该目录应该在IntelliJ中指定。您可以在项目结构中进行配置，按 Ctrl + Alt + Shift + S ，选择平台设置 - > SDKs ，点击绿色按钮（+），选择JDK的主目录。

So, that directory should designate in IntelliJ. You can configure in the Project Structure, press Ctrl + Alt + Shift + S, choose Platform Settings -> SDKs, click on green button (+), select the home directory for JDK.