DISK CRITICAL - /home/rdp/.gvfs is not accessible: Permission denied
Solution:
This is bug #615848. You can either give the nagios user permission to that file or just ignore the file during check. To ignore the file, edit the disk.cfg file located in /etc/nagios-plugins/config and add the arguments [-A -i '.gvfs'] at the end of the command line arguments for the command check_disk and check_all_disks.
REFERENCES
https://help.ubuntu.com/community/Nagios3
