In attempting to get the Mo' Creatures mod working on Kubuntu 11.10 with OpenJRE-6 I get the following error:

# A fatal error has been detected by the Java Runtime Environment:
#  SIGSEGV (0xb) at pc=0x00007ff855ec9c08, pid=4745, tid=140704592516864
# JRE version: 6.0_23-b23
# Java VM: OpenJDK 64-Bit Server VM (20.0-b11 mixed mode linux-amd64 compressed oops)
# Derivative: IcedTea6 1.11pre
# Distribution: Ubuntu 11.10, package 6b23~pre11-0ubuntu1.11.10
# Problematic frame:
# C  [libX11.so.6+0x35c08]  XQueryExtension+0x28
# If you would like to submit a bug report, please include
# instructions how to reproduce the bug and visit:
#   https://bugs.launchpad.net/ubuntu/+source/openjdk-6/

As per the report's suggestion, I was going to report the bug on launchpad, but figured I'd ask here first. There are others experiencing this as well: Mo' Creatures for Minecraft refusing to work

Any ideas? Mojang recommends 64 bit Java, which is what I'm using. Thanks in advance.


I am a minecraft player and have used many mods, but not Mo Creatures. Do you have any other mods set up that may be causing a conflict?

  • No this is the only mod. I have used other mods in the past and know how to install them without issue. Also, Mo' Creatures requires Modloader to run which I can install just fine. This mod appears to work in other Linux distributions, as well as Ubuntu 10.10 and 11.04 as far as I can tell from Googling the issue. – ronnoc Jan 9 '12 at 23:50

Submit bug report on launchpad alternatively you can use sun/oracle java see this questions

  1. How can I install Sun/Oracle's proprietary Java JDK 6/7/8 or JRE?
  2. How do I install Java?

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