latest report:
[error] RunTimeINIT: Java version not detected (using 7): 11.0.3+7-Ubuntu-1ubuntu218.04.1
java ?7?-64 version 11.0.3+7-Ubuntu-1ubuntu218.04.1 vm 11.0.3+7-Ubuntu-1ubuntu218.04.1 class 55.0 arch amd64
*** system properties dump 
awt.toolkit                   = sun.awt.X11.XToolkit
file.encoding                 = UTF-8
file.separator                = /
java.awt.graphicsenv          = sun.awt.X11GraphicsEnvironment
java.awt.printerjob           = sun.print.PSPrinterJob
java.class.path               = /usr/share/sikulix/sikulix.jar
java.class.version            = 55.0
java.home                     = /usr/lib/jvm/java-11-openjdk-amd64
java.io.tmpdir                = /tmp
java.library.path             = /usr/lib/jni:/usr/lib/alpha-linux-gnu/jni:/usr/lib/x86_64-linux-gnu/jni:/usr/lib/aarch64-linux-gnu/jni:/usr/lib/x86_64-kfreebsd-gnu/jni:/usr/lib/powerpc64-linux-gnu/jni:/usr/lib/powerpc64le-linux-gnu/jni:/usr/lib/s390x-linux-gnu/jni:/usr/lib/sparc64-linux-gnu/jni
java.runtime.name             = OpenJDK Runtime Environment
java.runtime.version          = 11.0.3+7-Ubuntu-1ubuntu218.04.1
java.specification.name       = Java Platform API Specification
java.specification.vendor     = Oracle Corporation
java.specification.version    = 11
java.vendor                   = Oracle Corporation
java.vendor.url               = http://java.oracle.com/
java.vendor.url.bug           = http://bugreport.java.com/bugreport/
java.version                  = 11.0.3
java.version.date             = 2019-04-16
java.vm.compressedOopsMode    = 32-bit
java.vm.info                  = mixed mode, sharing
java.vm.name                  = OpenJDK 64-Bit Server VM
java.vm.specification.name    = Java Virtual Machine Specification
java.vm.specification.vendor  = Oracle Corporation
java.vm.specification.version = 11
java.vm.vendor                = Oracle Corporation
java.vm.version               = 11.0.3+7-Ubuntu-1ubuntu218.04.1
jdk.debug                     = release
line.separator                = 

os.arch                       = amd64
os.name                       = Linux
os.version                    = 4.15.0-50-generic
path.separator                = :
python.home                   = /usr/share/jython
sikuli.console                = true
sun.arch.data.model           = 64
sun.boot.library.path         = /usr/lib/jvm/java-11-openjdk-amd64/lib
sun.cpu.endian                = little
sun.cpu.isalist               = 
sun.desktop                   = gnome
sun.font.fontmanager          = sun.awt.X11FontManager
sun.io.unicode.encoding       = UnicodeLittle
sun.java.command              = /usr/share/sikulix/sikulix.jar
sun.java.launcher             = SUN_STANDARD
sun.jnu.encoding              = UTF-8
sun.management.compiler       = HotSpot 64-Bit Tiered Compilers
sun.os.patch.level            = unknown
user.country                  = US
user.dir                      = /home/eisti
user.home                     = /home/eisti
user.language                 = en
user.name                     = eisti
user.timezone                 = Europe/Paris
*** system properties dump end
[info] runcmd: lsb_release -i -r -s 
Exception in thread "main" java.lang.ClassCastException: class jdk.internal.loader.ClassLoaders$AppClassLoader cannot be cast to class java.net.URLClassLoader (jdk.internal.loader.ClassLoaders$AppClassLoader and java.net.URLClassLoader are in module java.base of loader 'bootstrap')
	at org.sikuli.script.RunTime.storeClassPath(RunTime.java:2505)
	at org.sikuli.script.RunTime.isOnClasspath(RunTime.java:2552)
	at org.sikuli.script.RunTime.isJarOnClasspath(RunTime.java:2576)
	at org.sikuli.script.RunTime.libsExport(RunTime.java:933)
	at org.sikuli.script.RunTime.init(RunTime.java:720)
	at org.sikuli.script.RunTime.get(RunTime.java:297)
	at org.sikuli.ide.SikuliIDE.run(SikuliIDE.java:232)
	at org.sikuli.ide.Sikulix.main(Sikulix.java:31)