[Forge 1.14 world runs fine in single player, but won't run as a server.]

I have this world that seems to work great in single player, but when I try to port it over to a server, it keeps failing. The predominant error that seems to fail every time, and I've tried 28.1.22 to the latest is giving me:
 

Attempted to load class net/minecraft/client/settings/KeyBinding for invalid dist DEDICATED_SERVER

Attaching my logs related to the event to see what I might be missing.

debug.log latest.log crash-2019-10-02_23.22.11-server.txt

[Having trouble with converting from Windows to Linux dedicated server..]

Okay, so this is going to sound super noobish, but how does one downgrade java from 11 to 8 in linux.. So far instructions I've found online want to me install the 8 jdk directly from Oracle who - for some reason won't let me even create an account them as my access is 'blocked'

 

Edit: I found it in the end.. Mint had a bunch of open java 11 installed in their software suite.. it took awhile to find it but it's working.

Thank you for the tip.

[Having trouble with converting from Windows to Linux dedicated server..]

So, silly me, I figured that - being Java - it didn't matter what platform I would run my server on... so I have Mint Cinnamon installed to run my server.

First of all I can't run my original batch file as a command line:

java -d64 -Xincgc -Xmx8g -Dfml.readTimeout=420 -XX:+AggressiveOpts -XX:+UseConcMarkSweepGC -XX:+UseParNewGC -XX:+CMSIncrementalPacing -XX:ParallelGCThreads=2 -jar forge-1.12.2-14.23.5.2847-universal.jar

Java won't recognize any of the environment handlers I put in outside of the max memory limit... when I truncate it down, it still doesn't run, from what I can tell, it's not even trying to load Forge at all. I get.

java -Xmx6G -jar forge-1.12.2-14.23.5.2847-universal.jar 
A problem occurred running the Server launcher.java.lang.reflect.InvocationTargetException
	at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.base/java.lang.reflect.Method.invoke(Method.java:566)
	at net.minecraftforge.fml.relauncher.ServerLaunchWrapper.run(ServerLaunchWrapper.java:70)
	at net.minecraftforge.fml.relauncher.ServerLaunchWrapper.main(ServerLaunchWrapper.java:34)
Caused by: java.lang.ClassCastException: class jdk.internal.loader.ClassLoaders$AppClassLoader cannot be cast to class java.net.URLClassLoader (jdk.internal.loader.ClassLoaders$AppClassLoader and java.net.URLClassLoader are in module java.base of loader 'bootstrap')
	at net.minecraft.launchwrapper.Launch.<init>(Launch.java:34)
	at net.minecraft.launchwrapper.Launch.main(Launch.java:28)
	... 6 more

From what I can tell, I have installed Java, it skipped all the way up to

openjdk version "11.0.4" 2019-07-16
OpenJDK Runtime Environment (build 11.0.4+11-post-Ubuntu-1ubuntu218.04.3)
OpenJDK 64-Bit Server VM (build 11.0.4+11-post-Ubuntu-1ubuntu218.04.3, mixed mode)

When I do version check... So I'm somewhat at a loss as to where this is crapping out. I hope I've provided enough information, I've been running Forge servers off of windows for over a year now, and figured I'd know how to handle most simple issues, but I'm at a loss as to where to start.