sudo umount -l /mnt/share
sudo mount /mnt/share
Does umount -l have any risk? because it is a somewhat delicate machine within the structureA stale or hanging network share, the best option is to umount it with the l option and then remount it.
Code:sudo umount -l /mnt/share sudo mount /mnt/share
-l, --lazy
Lazy unmount. Detach the filesystem from the file hierarchy now, and clean up all references to this filesystem as soon as it is not busy anymore.