The server installed successfully
You can delete this installer file now if you wish
shock@shock-desktop:/opt/minecraft$ ls
forge-1.18.1-39.0.9-installer.jar  forge-1.18.1-39.0.9-installer.jar.log  libraries  run.bat  run.sh  user_jvm_args.txt
shock@shock-desktop:/opt/minecraft$ cd
shock@shock-desktop:~$ cd /opt/minecraft && java -Xms2G -Xmx10G -jar /opt/minecraft/libraries/net/minecraftforge/forge/1.18.1-39.0.9/forge-1.18.1-39.0.9-server.jar nogui
Error: Invalid or corrupt jarfile /opt/minecraft/libraries/net/minecraftforge/forge/1.18.1-39.0.9/forge-1.18.1-39.0.9-server.jar
shock@shock-desktop:/opt/minecraft$ cd /opt/minecraft && java -Xms2G -Xmx10G -jar /opt/minecraft/libraries/net/minecraftforge/forge/1.18.1-39.0.9/forge-1.18.1-39.0.9-universal.jar nogui
no main manifest attribute, in /opt/minecraft/libraries/net/minecraftforge/forge/1.18.1-39.0.9/forge-1.18.1-39.0.9-universal.jar