Comment 3 for bug 499773

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Scott James Remnant (Canonical) (canonical-scott) wrote : Re: /var/lib/ureadahead/debugfs lingering around

Also could you attach the output of "cat /proc/self/mountinfo"

It's possible that this bug is quite different, and that /var/lib/ureadahead/debugfs isn't mounted at all - but an errant entry got added to /etc/mtab by mountall because it was while it was running; and that entry doesn't get removed by ureadahead itself.