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I’ve got the following error message when I try to unmount a NFS share on my Ubuntu 12.04.2 LTS installation:

$ sudo umount /home/ubuntu/nfstest/client
/home/ubuntu/nfstest/client was not found in /proc/mounts
/home/ubuntu/nfstest/client was not found in /proc/mounts

I have used this mount command before:

$ sudo mount -t nfs 10.0.3.15:/foo /home/ubuntu/nfstest/client

There is a difference for the mount entry in /etc/mtab:

10.0.3.15:/foo /home/ubuntu/nfstest/client nfs rw,vers=4,...

and /proc/mounts:

10.0.3.15://foo /home/ubuntu/nfstest/client nfs4 rw,relatime,vers=4.0,...

In /proc/mounts the mount entry has always two slashes. On an older Ubuntu 12.04 LTS installation (without .2 at the end of the version string) the mount command works as expected and in there is only one slash in the corresponding entry in /proc/mounts.

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Please check the /etc/exports file on the NFS server. Sometimes a share is exported with additional slash which breaks the mount on client-side. –  mbaitoff Aug 13 '13 at 4:17
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