Comment 8 for bug 768614

ok, so based on this information about it being a ucf bug (confirmed, the error message in the ucf bug report is the same as the one here), this is fixed in Ubuntu 13.10 and later - though not, unfortunately, in 12.04.

If we continue to see reports of this problem on upgrades from 12.04 to 14.04, we can consider an SRU of ucf to 12.04 to mitigate.