Right, so. I had a mod idea and decided this may be a nice way to boost my knowledge of java; step one install forge. I ran the official and latest 1.12.2 installer from files.minecraftforge.net, and it completed the installation. I now have a forge 1.12.2 version and inside the version folder is a .json file. However, when I attempt to launch the game, I get the "unexpected issue occurred" error and it stops instantly. At no point does a game window open. My latest log file is completely empty aside from this:

[16:49:35] [Client thread/INFO]: Setting user: #manually removed username#
[16:49:36] [Client thread/INFO]: LWJGL Version: 2.9.4
[16:49:37] [Client thread/INFO]: Reloading ResourceManager: Default
[16:49:37] [Sound Library Loader/INFO]: Starting up SoundSystem...
[16:49:38] [Thread-2/INFO]: Initializing LWJGL OpenAL
[16:49:38] [Thread-2/INFO]: (The LWJGL binding of OpenAL.  For more information, see http://www.lwjgl.org)
[16:49:38] [Thread-2/INFO]: OpenAL initialized.
[16:49:38] [Sound Library Loader/INFO]: Sound engine started
[16:49:39] [Client thread/INFO]: Created: 1024x512 textures-atlas
[16:49:40] [Client thread/INFO]: Narrator library successfully loaded
[17:02:14] [Client thread/INFO]: Stopping!
[17:02:14] [Client thread/INFO]: SoundSystem shutting down...
[17:02:14] [Client thread/WARN]: Author: Paul Lamb, www.paulscode.com

As far as I can tell there is no error, other than "Stopping!", which is of course is why I came here.
I am using Linux mint 19.1 Tessa and the official game/launcher.
Sorry if I have posted this wrong, I'm not used to forum interfaces.

Edited May 31, 20196 yr by Blockmutant

7 minutes ago, diesieben07 said:

Post the debug log as described in the EAQ and also the launcher log, if available.

I don't thing it got far enough to generate a debug log, and I know it sounds dumb but when I paste the launcher log my browser crashes due to the size, is there anything I can exclude from it?

8 minutes ago, diesieben07 said:

You can post it on sites like pastebin or gist.github.com.

Ah ok, here we go https://gist.github.com/Blockmutant/21437e929a7807a1beac713ce706ab2e
 

42k lines
Oh, and I should mention that I removed my name from the file paths in the log, they would usually be /home/name/.minecraft

Edited May 31, 20196 yr by Blockmutant
name removal

1 minute ago, diesieben07 said:

You are using Java 9 or higher. You must use Java 8 for Forge before 1.13.

aha thanks, something as big as that will probably be the issue, but If I have any more should I post here or start a new thread?

Update: there were no further errors and this solved my issue; the game now launches.