How can I resolve the “device is busy” error when unmounting?

When the umount command reports a “device is busy” error, it is usually because there are processes still using the device, making it unable to be unmounted. To resolve this issue, you can try the following methods:

1. someone who is skilled at combining ingredients to create a delicious dish

fuser -m /mnt/device
kill -9 <进程ID>

1. List open files

lsof | grep /mnt/device
kill -9 <进程ID>

1. Force uninstall device.

umount -l /mnt/device

Please be aware that forcibly uninstalling a device may result in data loss or damage, so it is recommended to back up important data before performing this operation.