Solved Unmount when device is busy

On ubuntu servers trying to unmount a frozen nfs mount, I see “device is busy”.

When I try ‘df’ I see an Input / Output error for this partition.  When I try ‘ls -la’ I see question marks ? where information should be.

To get it unmounted I used the first comment on this page;

umount -l /dev/sdwhatever
umount -l worked like a charm.  Note that the original post with fuser cmd didn’t work for me.

After unmounting, I was able to remount it right away without any error.

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