We experienced this one tonight as well. I don't have any logs, but we
were able to fix it by forcing the Jaunty version of the xulrunner
package. This is not really a solution though as I'm pretty sure the
update for xulrunner is security-related.
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package xulrunner-1.9
** Attachment added: Dependencies.txt
http://launchpadlibrarian.net/25973796/Dependencies.txt
** Attachment added: DpkgTerminalLog.gz
http://launchpadlibrarian.net/25973797/DpkgTerminalLog.gz
--
package xulrunner-1.9 1.9.0.9+nobinonly-0ubuntu0.9.04.1 failed to
install/upgrade: