How do you force an unmount file system in Linux?

Option 0: Try to remount the filesystem if what you want is remounting

1. Option 0: Try to remount the filesystem if what you want is remounting.
2. Option 1: Force unmount.
3. Option 2: Kill the processes using the filesystem and then unmount it. Method 1: use lsof. Method 2: use fuser.

How do I force a disk unmount?

Linux fuser command to forcefully unmount a disk partition

1. -k : Kill processes accessing the file.
2. -m : Name specifies a file on a mounted file system or a block device that is mounted. In above example you are using /mnt.