尝试将 Java 升级到最新版本的 Minecraft 服务器（v1.18）时，我遇到了一点麻烦，因为服务器最初运行的是 Ubuntu 19.x，所以在找到允许我的地方后，我转换到了 20.04更新所有软件包并进行升级。
之后我安装了 JRE，这是显示我所使用的版本的相同命令：
mortimer@mineraft:/home/minecraft$ sudo apt-get install default-jre
Reading package lists... Done
Building dependency tree
Reading state information... Done
default-jre is already the newest version (2:1.11-72).
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
与 JDK 类似：
mortimer@mineraft:/home/minecraft$ sudo apt-get install default-jdk
Reading package lists... Done
Building dependency tree
Reading state information... Done
default-jdk is already the newest version (2:1.11-72).
0 upgraded, 0 newly installed, 0 to remove and …