Cannot unmount folder

I created a folder on Ubuntu NFS server, I mounted it on Ubuntu client as MOUNTME. Now when I tried to unmount it , it gives me message:

umount : /home/test/MOUNTME is not in the FStab (and you are not root)

I wonder what is causing the issue.

Thanks
jskfanAsked:
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skullnobrainsConnect With a Mentor Commented:
sudo umount /home/test/MOUNTME

@gerwind : he would not be able to mount a random dir as a regular user
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Gerwin Jansen, EE MVEConnect With a Mentor Topic Advisor Commented:
You are trying to unmount as a non-root user. How did you mount it?
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MazdajaiConnect With a Mentor Commented:
Try

sudo umount /home/test/MOUNTME

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SandyCommented:
First please paste output of #mount command.

To me it seems like it was already umounted.

TY/SA
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jskfanAuthor Commented:
I have rebooted ubuntu NFS client, apparently the the folder gets dismounted, when I try to remount it , I get the messages displayed in the snapshot:
nfs
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SandyCommented:
did you putted any entry for MOUNTME ?

TY/SA
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SandyConnect With a Mentor Commented:
i mean in /etc/fstab ?
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jskfanAuthor Commented:
sorry , ignore the last snapshot
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jskfanAuthor Commented:
I managed to remount the folder, but when I try to unmount it here is what I get:

nfs
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simon3270Connect With a Mentor Commented:
The problem is that you are not root, so it can't work out which device you are trying to unmount.  If the entry was in /etc/fstab, with the "user" option, you woudl be able to mount and unmount it as a normal user.

Since it isn't, you need to be root - as Mazdajai suggested, try

    sudo umount MOUNTME

You became root to mount it (with sudo), so why won't you become root to unmount it?
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Gerwin Jansen, EE MVETopic Advisor Commented:
@jskfan - You missed my initial question "How did you mount it?" - knowing that you used 'sudo' would make the answer easy :)
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jskfanAuthor Commented:
even with root, it does not unmount it

mount
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jskfanAuthor Commented:
mnt
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simon3270Commented:
Was the disk definitely mounted before you ran the "sudo umount MOUNTME"?

Could you have a single screenshot which had:
$ sudo mount -t nfs4 -o proto=tcp,port=2049 172.16.27.100:DATA1 MOUNTME
$ mount | grep MOUNTME
$ sudo umount MOUNTME

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jskfanAuthor Commented:
I will check it later…Thank you Guys!
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