Minecraft crashes after 2 to 30 seconds of gameplay.

[1337ing Disorder]

I've been running minecraft 1.4.2 fine since it came out, but just today Java has started crashing every time I play it.

The menu screen seems fine, but once I log onto an actual server and start playing I get between 2 and 30 seconds of gameplay before everything crashes out to the desktop.

I tried running it from console and got this output when Java crashed:

#
# A fatal error has been detected by the Java Runtime Environment:
#
# SIGSEGV (0xb) at pc=0x00000000b69613e8, pid=3788, tid=139644729071360
#
# JRE version: 6.0_24-b24
# Java VM: OpenJDK 64-Bit Server VM (20.0-b12 mixed mode linux-amd64 compressed oops)
# Derivative: IcedTea6 1.11.5
# Distribution: Ubuntu 12.04 LTS, package 6b24-1.11.5-0ubuntu1~12.04.1
# Problematic frame:
# C 0x00000000b69613e8
#
# An error report file with more information is saved as:
# /home/omni/hs_err_pid3788.log
#
# 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/
#
Aborted (core dumped)

[1337ing Disorder (scott-johnstone)]

I can't find a way to report the bug as fixed, so I'll just mention it here.

There were a couple medibuntu libraries that had been getting omitted from recent updates through update-manager, due to gpg signature issues with the medibuntu repo.

After manually updating via command-line the crashy behaviour stopped right away, and it hasn't crashed since.