DebugPoint published a tutorial about installing the latest version of Java 14 in Ubuntu Linux or Linux Mint.

How to Install Latest Java 14 in Ubuntu 18.04, 20.04, Linux Mint

Oracle Java 14 is released. And here’s how you can download and install in Ubuntu 18.04 LTS, Ubuntu 20.04 LTS, 19.10 and Linux Mint 18.x, 19.x. Oracle announced the release of the latest Java 14 for developers and enterprises. Installing the latest Java 14 is not straight forward without adding PPA. There are certain alternatives

How to Install Latest Java 14 in Ubuntu 18.04, 20.04, Linux Mint