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[jbatista <jmn.batista@xxxxxxxxx>]

Looking elsewhere, I happened to find a solution here:
https://www.digisoftinc.org/wiki/index.php/Linux_Notes#Eclipse_3.4_and_Ubuntu_9.10_Fix
It's not clear whether the author(s) discovered it by them/him/herself or whether copied+pasted from somewhere else.

For reference, it involves installing xulrunner and editing eclipse.ini, i.e.:
1. sudo apt-get install xulrunner
2. echo '-Dorg.eclipse.swt.browser.XULRunnerPath=/usr/lib/xulrunner' >>/usr/lib/eclipse/eclipse.ini

After doing these two steps, I restarted eclipse. The SIGSEGV on
pressing the Cancel button on the Install new software ... menu no
longer happens.

Please note: This solution is also reported in bug #393091

-- 
Eclipse SIGSEGVs in libpango
https://bugs.launchpad.net/bugs/445009
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which is subscribed to openjdk-6 in ubuntu.

Status in Eclipse: Fix Released
Status in “eclipse” package in Ubuntu: Fix Released
Status in “openjdk-6” package in Ubuntu: Invalid
Status in “eclipse” source package in Karmic: New
Status in “openjdk-6” source package in Karmic: New
Status in “eclipse” package in Fedora: Fix Committed

Bug description:
=============
BUG
=============
After having started Eclipse 3.5 on Karmic 32bit (openjdk-6-jre 6b16-1.6.1-1ubuntu2) and running it for some minutes, it terminates saying

#
# A fatal error has been detected by the Java Runtime Environment:
#
#  SIGSEGV (0xb) at pc=0xb7b62856, pid=24497, tid=3084424896
#
# JRE version: 6.0_15-b03
# Java VM: Java HotSpot(TM) Client VM (14.1-b02 mixed mode, sharing linux-x86 )
# Problematic frame:
# C  [libpango-1.0.so.0+0x23856]  pango_layout_new+0x36
#
# An error report file with more information is saved as:
# /home/niklas/hs_err_pid24497.log
[...]

Seems to be the bug in https://bugzilla.redhat.com/show_bug.cgi?id=522187 , but for the bug opener, the problem seems to be gone.
Please tell me if you need more information.

=============
WORKAROUND
=============
Disable assistive technologies:
System > Preferences > Assistive Technology Preferences > "Enable assistive technologies"

-OR-

Replace /usr/lib/eclipse/plugins/org.eclipse.swt.gtk.linux.x86_3.5.1.v3555a.jar (rename it to .backup or something) with
32bit Ubuntu: http://launchpadlibrarian.net/36500083/org.eclipse.swt.gtk.linux.x86_3.5.1.v3555a.jar
64bit Ubuntu: http://launchpadlibrarian.net/36643806/org.eclipse.swt.gtk.linux.x86_64_3.5.1.v3555a.jar
(See comment 44 and 47 for more info)