Problems updating Java on Ubuntu 20.04 for Minecraft 1.18
Solution 1:
Minecraft: Java Edition version 1.18 won't work on Java 8. It requires Java 17. If Minecraft is the only thing you use Java for, I'd suggest uninstalling what you have now:
sudo apt remove default-jre default-jdk
sudo apt autoremove
Now, install OpenJDK 17:
sudo apt update
sudo apt install openjdk-17-jre
We don't install the JDK because it is for compiling Java programs. You aren't, instead you are running one (Minecraft), so you only need the JRE.
| Minecraft Version | Java Version |
|---|---|
| 1.16 | 16 |
| 1.17 | 16 |
| 1.18 | 17 |