Diego Marvid

Ok, it worked! I'm going to list the stepts I did for future users with the same problem: You have to be in the command line where you start, not in some folder, then: sudo apt-get remove --purge openjdk* java-common default-jdk sudo apt-get autoremove --purge sudo apt-get install openjdk-8-jdk sudo update-ca-certificates -f sudo /var/lib/dpkg/info/ca-certificates-java.postinst configure //Here you go to your minecraft server folder cd Minecraft/Server/ java -Djava.net.preferIPv4Stack=true -jar forge.jar --installServer

Sorry, here it is: PD: you can open it with notepad++ for the correct format forge.jar.log

Ok, I did these steps as they appeared in the link: sudo apt-get remove --purge openjdk* java-common default-jdk sudo apt-get autoremove --purge sudo update-alternatives --config java sudo apt-get install openjdk-8-jdk And it was much better, now I have just 1 error:

Here is the log of the command forge.jar.log

Ok I will, its the same error as Image 2 in my first post but i will post it anyway: --------------------------------------------------------------------------------------------------------------- First picture: you can see the command at the beginning. Second picture: you can see the error at the end Third picture: how the folder ended after the command (forge.jar and minecraft_server.1.12.2.jar were there at the beginning). ----------------------------------------------------------------------------------------------------------------

Fair enough, I re-installed java 8 and reboot my pc but same problem is happening (and yes the file is minecraft_server.1.12.2.jar without any uppercase)

Why would java be the problem if i can run a vanilla java server without a problem?

In this image you can see in the first one that I executed the code you said: java -Djava.net.preferIPv4Stack=true -jar forge-1.12.2-14.23.4.2705-installer.jar --installServer And in the second one you can see how the same error is still ocurring. Also, in the second image of this post you can see how I renamed as you said the minecraft.jar but I still have errors

That's what I did on Image 2

Thank you for your quick reply, I was reading previous posts about this topic before publishing it, I tried what diesieben07 said but I had the same error. And yes I verified and I have java 8 version.

Hello, I was trying to run my forge modded server on my linux mint virtual machine but I came up with this error. I don't think that it's my java version because I can run a Vanilla server without a problem. I tried with previous versions of forge but the error kept appearing. When I upload Minecraft_Server.1.12.2.jar manually appears another error about some libraries that failed downloading (image 2). As well, when I try to run a pre-made server, it gives me an error as well (I have no problem running it on my windows pc). Image 3 Looking forward to an answer