disappearing mounted volumes

[Nils Kassube]

Kevin O'Gorman wrote:
> I'm running Xubuntu 14.04.1.  From time to time my mounted volumes
> become inaccessable, and any attempt to use them gives an I/O error. 
> In such cases, attempts to umount them results in the message that
> "<mount point> mount disagrees with the fstab".

That's a strange error message. After all it is possible to mount things 
at mount points other than what is mentioned in fstab for the device. Do 
you perhaps mean mtab instead?

Another possible explanation: While the device is mentioned in fstab 
with the "noauto,users" option, it was automatically mounted by xfce at 
a different mount point. And if you then try to unmount the device as 
"normal" user (without sudo) it wouldn't work.

Anyway, did you check where the volumes were actually mounted? And did 
you compare the result with fstab?

You could also try to unmount the device with the -f option, which might 
help.


Nils