Ugdhar

1.12 is no longer supported, support is only provided for 1.18 and 1.19 currently.

You probably will need to redownload, just make sure you are downloading mods from an appropriate source, do not just google for them. curseforge is probably the primary place for getting mods, just avoid sites with numbers in their names (i.e. minecraft1), and when it doubt check the mod repost list https://stopmodreposts.org/

Side note, I do believe 1.19 requires Java 17, so don't just update your Java 8 to a newer Java 8, you need Java 17

You need to post logs and/or provide more information. There are approximately 1,467,321,236,245 potential problems you could be having, so we need something to narrow down the possibilities

I'd go with tmux or screen for running a terminal you can detach from. https://www.howtogeek.com/671422/how-to-use-tmux-on-linux-and-why-its-better-than-screen/

1.12 is no longer supported, you will need to update to receive support. Information on supported versions can be found here, or at the blue bar link at the top of the forum pages:

There's either a server already running, or something else running on the MC port.

I would wager a problem with rubidium, does it have a newer version maybe?

Nope, that's the changelog

It should be in the same folder as the installer, same name I believe but .log extension.

Unfortunately, 1.12 is no longer supported. More information on supported versions can be found here:

Please post your full debug.log it will have more information in it.

Please post the debug.log it will have more information in it than the crashlog.

Is that the full log? It looks like it ends early, not seeing a crash at the end like before.

Always post new logs if you make a change, and it is still broken. This will both ensure the removed mod is indeed removed, as well as provide information for why it continues to crash.

Optifine works with specific versions of forge, they show which ones on the download page. Just like any other mod author, if forge makes changes, then the mod (in this case optifine) will potentially need updating. This should be brought to the optifine developer

If I had to choose, I would choose adoptium 100%. *edit: Well, I guess I DID, since I downloaded my java from adoptium java-for-minecraft sounds like a google result that will hack your computer lol.

This error makes me think your save file is broken: Missing mod: Broken/malformed config: (looked like there were more of these) My guess is that enough changed in forge and/or the mods you're using from 1.16 -> 1.18 that your world probably won't load/run without tweaking, if at all. Possibly someone else will see this and have an idea how you can fix it, but my thoughts are you probably need to play the 1.16 world in 1.16.

This might seem like a silly question, but did you run the forge installer to install the server? If so, can you post the installer log?

Did a quick search of the forums for "PKIX path", and from what I gather in the results, there is an issue with your java installation. Uninstall it completely, then reinstall. If it still doesn't work, post the installer log please

Post the debug.log from your logs folder, it will hopefully have the information needed to figure out why.

I'd start with Oh The Biomes You'll Go

Also I do not believe 1.16 is supported any longer, I believe 1.18 is LTS and 1.19 is current

It would appear it used up all the memory allocated to it, you should give it more memory by modifying the -Xmx value