Cannot update to 18.3. cannot unmount sda1

Hi, during the update of nwsp2 firmware directly from the web interface, on STEP 2 i receive this:
I suspect that samba is locking the partition.
- Code: Select all
=> Firmware upgrade step 2 started:
Firmware package uploaded via fvdw-sl server
package type: new configuration (version > 16.1)
firmware image type: extended file system (version > 17.0)
Check firmware files archive ... OK
Check kernel version... new version must be installed
Check DATABASE file... OK
Check active partition... OK
Install new common firmware files on /dev/sda1, ... Fail
could not unmount the new system partition
I suspect that samba is locking the partition.