Package: sikuli Version: 1.0~x~rc3.tesseract3-dfsg1-8 The execution wrapper has a classpath defined, but in some places the "constants" libconstantine-java transitional library in Depends is a empty transitional package to libjnr-constants-java . That makes sikuli fail at startup.
$ sikuli-ide Exception in thread "main" java.lang.NoClassDefFoundError: com/kenai/constantine/Constant Also at https://bugs.launchpad.net/ubuntu/+source/sikuli/+bug/1456675 The fix is to add "/usr/share/java/jnr-constants.jar:" into the classpath.