Exception:

java.lang.NoClassDefFoundError: Could not initialize class sun.awt.X11GraphicsEnvironment
	at java.lang.Class.forName0(Native Method)
	at java.lang.Class.forName(Class.java:264)
	at java.awt.GraphicsEnvironment.createGE(GraphicsEnvironment.java:103)
	at java.awt.GraphicsEnvironment.getLocalGraphicsEnvironment(GraphicsEnvironment.java:82)
	at sun.awt.X11.XToolkit.<clinit>(XToolkit.java:126)
	at java.lang.Class.forName0(Native Method)
	at java.lang.Class.forName(Class.java:264)
	at java.awt.Toolkit$2.run(Toolkit.java:860)
	at java.awt.Toolkit$2.run(Toolkit.java:855)
	at java.security.AccessController.doPrivileged(Native Method)
	at java.awt.Toolkit.getDefaultToolkit(Toolkit.java:854)
	at sun.swing.SwingUtilities2.getSystemMnemonicKeyMask(SwingUtilities2.java:2020)
	at javax.swing.plaf.basic.BasicLookAndFeel.initComponentDefaults(BasicLookAndFeel.java:1158)
	at javax.swing.plaf.metal.MetalLookAndFeel.initComponentDefaults(MetalLookAndFeel.java:431)
	at javax.swing.plaf.basic.BasicLookAndFeel.getDefaults(BasicLookAndFeel.java:148)
	at javax.swing.plaf.metal.MetalLookAndFeel.getDefaults(MetalLookAndFeel.java:1577)
	at javax.swing.UIManager.setLookAndFeel(UIManager.java:539)
	at javax.swing.UIManager.setLookAndFeel(UIManager.java:579)
	at javax.swing.UIManager.initializeDefaultLAF(UIManager.java:1349)
	at javax.swing.UIManager.initialize(UIManager.java:1459)
	at javax.swing.UIManager.maybeInitialize(UIManager.java:1426)
	at javax.swing.UIManager.getUI(UIManager.java:1006)
	at javax.swing.JPanel.updateUI(JPanel.java:126)
	at javax.swing.JPanel.<init>(JPanel.java:86)
	at javax.swing.JPanel.<init>(JPanel.java:109)
	at javax.swing.JPanel.<init>(JPanel.java:117)
	at com.install4j.runtime.installer.frontend.FormPanel.<init>(FormPanel.java:50)
	at com.install4j.runtime.installer.frontend.headless.AbstractHeadlessScreenExecutor.init(AbstractHeadlessScreenExecutor.java:67)
	at com.install4j.runtime.installer.frontend.headless.ConsoleScreenExecutor.<init>(ConsoleScreenExecutor.java:24)
	at com.install4j.runtime.installer.frontend.headless.InstallerConsoleScreenExecutor.<init>(InstallerConsoleScreenExecutor.java:6)
	at com.install4j.runtime.installer.Installer.getScreenExecutor(Installer.java:76)
	at com.install4j.runtime.installer.Installer.runInProcess(Installer.java:40)
	at com.install4j.runtime.installer.Installer.main(Installer.java:28)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:497)
	at com.exe4j.runtime.LauncherEngine.launch(LauncherEngine.java:62)
	at com.install4j.runtime.launcher.UnixLauncher.main(UnixLauncher.java:57)

System properties:

java.runtime.name=Java(TM) SE Runtime Environment
exe4j.moduleName=/home/cmosig/Downloads/JD2Setup_x64.sh
sun.boot.library.path=/home/cmosig/Downloads/JD2Setup_x64.sh.2860.dir/jre/lib/amd64
java.vm.version=25.66-b17
java.vm.vendor=Oracle Corporation
java.vendor.url=http://java.oracle.com/
path.separator=:
java.vm.name=Java HotSpot(TM) 64-Bit Server VM
file.encoding.pkg=sun.io
user.country=US
sun.java.launcher=SUN_STANDARD
sun.os.patch.level=unknown
install4j.exeDir=/home/cmosig/Downloads/
java.vm.specification.name=Java Virtual Machine Specification
user.dir=/home/cmosig/Downloads/JD2Setup_x64.sh.2860.dir
java.runtime.version=1.8.0_66-b17
java.awt.graphicsenv=sun.awt.X11GraphicsEnvironment
i4jv=0
java.endorsed.dirs=/home/cmosig/Downloads/JD2Setup_x64.sh.2860.dir/jre/lib/endorsed
os.arch=amd64
java.io.tmpdir=/tmp
line.separator=

java.vm.specification.vendor=Oracle Corporation
os.name=Linux
exe4j.totalDataLength=50606829
sun.java2d.noddraw=true
sun.jnu.encoding=UTF-8
java.library.path=/usr/java/packages/lib/amd64:/usr/lib64:/lib64:/lib:/usr/lib
java.specification.name=Java Platform API Specification
java.class.version=52.0
sun.management.compiler=HotSpot 64-Bit Tiered Compilers
os.version=4.13.5-200.fc26.x86_64
i4j.vpt=true
install4j.cwd=/home/cmosig/Downloads
user.home=/root
user.timezone=Europe/Berlin
java.awt.printerjob=sun.print.PSPrinterJob
file.encoding=UTF-8
install4j.jvmDir=/home/cmosig/Downloads/JD2Setup_x64.sh.2860.dir/jre
java.specification.version=1.8
java.class.path=i4jruntime.jar:user.jar:user/JDownloader.jar:user/proxyVole.jar
user.name=root
java.vm.specification.version=1.8
sun.java.command=com.install4j.runtime.launcher.UnixLauncher launch 0   com.install4j.runtime.installer.Installer
java.home=/home/cmosig/Downloads/JD2Setup_x64.sh.2860.dir/jre
sun.arch.data.model=64
user.language=en
java.specification.vendor=Oracle Corporation
awt.toolkit=sun.awt.X11.XToolkit
java.vm.info=mixed mode
java.version=1.8.0_66
java.ext.dirs=/home/cmosig/Downloads/JD2Setup_x64.sh.2860.dir/jre/lib/ext:/home/cmosig/Downloads/JD2Setup_x64.sh.2860.dir/jre/jre/lib/ext
sun.boot.class.path=/home/cmosig/Downloads/JD2Setup_x64.sh.2860.dir/jre/lib/resources.jar:/home/cmosig/Downloads/JD2Setup_x64.sh.2860.dir/jre/lib/rt.jar:/home/cmosig/Downloads/JD2Setup_x64.sh.2860.dir/jre/lib/sunrsasign.jar:/home/cmosig/Downloads/JD2Setup_x64.sh.2860.dir/jre/lib/jsse.jar:/home/cmosig/Downloads/JD2Setup_x64.sh.2860.dir/jre/lib/jce.jar:/home/cmosig/Downloads/JD2Setup_x64.sh.2860.dir/jre/lib/charsets.jar:/home/cmosig/Downloads/JD2Setup_x64.sh.2860.dir/jre/lib/jfr.jar:/home/cmosig/Downloads/JD2Setup_x64.sh.2860.dir/jre/classes
java.awt.headless=true
install4j.appDir=/home/cmosig/Downloads/
java.vendor=Oracle Corporation
file.separator=/
java.vendor.url.bug=http://bugreport.sun.com/bugreport/
sun.font.fontmanager=sun.awt.X11FontManager
sun.io.unicode.encoding=UnicodeLittle
sun.cpu.endian=little
sun.cpu.isalist=