Umount failed-Linux

16. Why umount old display Device Busy ?

This is becauseProgramAccessing the device. The simplest way is to exit the program that accesses the device.Umount. Sometimes users cannot determine what programs are accessing the device.Umount, You can use:

# Umount-L/mnt/hda5

to uninstall the device. Option -L not immediately umount , but after the directory is idle umount . You can also run the PS aux to view the programs that occupy the device PID , and then run the kill to kill the process that occupies the device, so that umount very reassuring.