How to resolve the issue of busy when unmounting in Linux.

When attempting to unmount a filesystem that is in use in the Linux system, a “busy” message will appear. This typically happens when there are processes accessing the filesystem or files open which prevent it from being unmounted.

To address this issue, the first step is to identify which processes or files are currently using the file system. You can use the following commands to check:

sudo lsof | grep /mnt/your_mount_point

Replace /mnt/your_mount_point with the mount point you want to unmount. This will list the processes and files accessing that file system.

Next, you may choose to either close those processes or release the open status of the files. If you are unable to close those processes or files, you can try forcefully unmounting them, but this may result in data loss or file system damage. You can use the following command to forcefully unmount:

sudo umount -l /mnt/your_mount_point

Please be aware that forcefully unmounting may cause unforeseen issues, it is recommended to backup data when necessary and handle with caution.