Not starting on Linux

On my Linux Ubuntu Unity 26.04, launching the jar does nothing.

$ which java
/usr/bin/java
$ java -version
openjdk version "21.0.11-ea" 2026-04-21
OpenJDK Runtime Environment (build 21.0.11-ea+8-Ubuntu-1)
OpenJDK 64-Bit Server VM (build 21.0.11-ea+8-Ubuntu-1, mixed mode, sharing)
$ echo $JAVA_HOME
/usr/lib/jvm/java-21-openjdk-amd64
$ echo $DISPLAY
:0
$ uname -a
Linux ASUS 7.0.0-15-generic #15-Ubuntu SMP PREEMPT_DYNAMIC Wed Apr 22 16:06:43 UTC 2026 x86_64 GNU/Linux

$ bash forge.sh
(immediately exits, no errors printed)
$ java -Xmx4096m -Dio.netty.tryReflectionSetAccessible=true -Dfile.encoding=UTF-8 -jar forge-gui-desktop-2.0.14-jar-with-dependencies.jar
(immediately exits, no errors printed)

Start with forge.sh and the forge-gui-desktop-2.0.14-jar-with-dependencies.jar launch command on the reported Ubuntu and Java versions. Capture the immediate-exit failure and determine whether the fix belongs in the launcher or desktop startup path; done means the application starts on the reported Linux setup with a clear regression test or reproduction note.

Written by the indexing model from the issue text.