8676 ExecStart=/usr/bin/java -Xms2G -Xmx4G -jar /opt/minecraft/jars/server.jar nogui (code=exited, status=1/FAILURE)

This error message indicates that there was a problem starting the Minecraft server. Specifically, the command "/usr/bin/java -Xms2G -Xmx4G -jar /opt/minecraft/jars/server.jar nogui" failed to execute properly, with a status code of 1/FAILURE.

There could be a variety of reasons why the command failed, including:

- The Java runtime environment is not installed or configured properly on the system.
- The Minecraft server jar file is missing or corrupted.
- The server.properties file is misconfigured.
- There are conflicting ports or network settings.

To troubleshoot the issue, you may need to review the system logs and Minecraft server logs for more specific error messages. You may also need to consult documentation or seek assistance from the Minecraft community to resolve the issue.