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https://bugzilla.redhat.com/show_bug.cgi?id=695405
--- Comment #11 from Nicolas Mailhot nicolas.mailhot@laposte.net 2012-04-05 09:19:30 EDT --- Either way the problem is in the cantarell package since it can (and should) specify its own fallback rules.
However Cantarell is a new design, and I don't think it included consideration for the metrics of existing fonts, so there is probably no metrically-compatible font to fallback to.