Compiled answer by myself:

Get fresh link from: https://jdk.java.net/14/

Download binary:

wget https://download.java.net/java/GA/jdk14.0.2/205943a0976c4ed48cb16f1043c5c647/12/GPL/openjdk-14.0.2_linux-x64_bin.tar.gz

Unpack it:

tar xvf openjdk-14.0.2_linux-x64_bin.tar.gz

Move to jvm folder:

mv jdk-14.0.2 /usr/lib/jvm

Update java and javac alternatives:

update-alternatives --install "/usr/bin/javac" "javac" "/usr/lib/jvm/jdk-14.0.2/bin/javac" 3
update-alternatives --install "/usr/bin/java" "java" "/usr/lib/jvm/jdk-14.0.2/bin/java" 3
update-alternatives --set "javac" "/usr/lib/jvm/jdk-14.0.2/bin/javac"
update-alternatives --set "java" "/usr/lib/jvm/jdk-14.0.2/bin/java"

Use to switch between versions:

update-alternatives --config java

Answer from pavelety on askubuntu.com
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OpenJDK
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OpenJDK: Download and install
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Bell Software
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JDK 14
JDK 14 is the open-source reference implementation of version 14 of the Java SE Platform as specified by by JSR 389 in the Java Community Process · JDK 14 reached General Availability on 17 March 2020. Production-ready binaries under the GPL are available from Oracle; binaries from other vendors ...
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Open Jdk - How To Install OpenJDK Java 14 On Ubuntu 18.04 / ubuntu 20
March 22, 2026 - Quick guide to download and install OpenJDK 14 on Ubuntu 18.04 / ubuntu 20.04.
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Ask Ubuntu
askubuntu.com › questions › 1335824 › open-jdk-14-for-ubuntu-18-04
java - Open JDK 14 for Ubuntu 18.04 - Ask Ubuntu
wget https://download.java.net/openjdk/jdk14/ri/openjdk-14+36_linux-x64_bin.tar.gz tar xvfz openjdk-14+36_linux-x64_bin.tar.gz mv ./jdk-14/ /usr/lib/jvm/ update-alternatives --install "/usr/bin/javac" "javac" "/usr/lib/jvm/jdk-14/bin/javac" 1081 update-alternatives --install "/usr/bin/java" "java" "/usr/lib/jvm/jdk-14/bin/java" 1081 update-alternatives --set "javac" "/usr/lib/jvm/jdk-14/bin/javac" update-alternatives --set "java" "/usr/lib/jvm/jdk-14/bin/java" update-alternatives --config java ·
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Archived OpenJDK GA Releases - Java.NET
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JDK Project
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adoptopenjdk/openjdk14 - Docker Image
jre-nightly, jre14u, jre14u-ubuntu-nightly, aarch64-ubuntu-jre14u-nightly, armv7l-ubuntu-jre14u-nightly, ppc64le-ubuntu-jre14u-nightly, s390x-ubuntu-jre14u-nightly, x86_64-ubuntu-jre14u-nightly, (14/jre/ubuntu/Dockerfile.hotspot.nightly.full)⁠ · Where to get help: Community support⁠; Join AdoptOpenJDK Slack⁠ ... Java™ is the world's leading programming language and platform. The code for Java is open source and available at OpenJDK™⁠. AdoptOpenJDK⁠ provides prebuilt OpenJDK binaries from a fully open source set of build scripts⁠ and infrastructure.