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fuser -kis extremely risky, as you'll be doing it as root and if you're not very sure of which processes will be killed off you can do truly spectacular damage with a careless command...-koption, so you'll know which processes you're going to kill. But I'll add in a warning.fuser -vmshowed "kernel mount". had to dosystemctl stop opt.mountinstead of manualumount.umount -fand NFS. My issue was NFS related where my dev machines changed IPs and I could not get the share removed.