Comment 11 for bug 1516451

We normally netboot but we had a few machines that would not PXE, so we installed 14.04 via medium. Afterwards, some of the medium-installed machines were throwing this error in Nagios. Found this line in /etc/mtab on the afflicted hosts:

tracefs /var/lib/ureadahead/debugfs/tracing tracefs rw,relatime 0 0

This appears to be an artifact on the medium-based install process. I removed the above line and ran:

sudo service nagios-nrpe-server restart

Error condition cleared.