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lombardo@lombardo-Precision-M4800:~$ umount /dev/sdb1
umount: /: umount failed: Operazione non permessa.
1 lombardo@lombardo-Precision-M4800:~$                                                                               

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otal events = 1)
[18162.046261] powercap intel-rapl:0: package locked by BIOS, monitoring only
[18162.046261] powercap intel-rapl:0: package locked by BIOS, monitoring only
[18899.178516] usb 4-5: new SuperSpeed USB device number 5 using xhci_hcd
[18899.199264] usb 4-5: New USB device found, idVendor=0bc2, idProduct=61b6
[18899.199267] usb 4-5: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[18899.199269] usb 4-5: Product: M3 Portable
[18899.199271] usb 4-5: Manufacturer: Seagate
[18899.199273] usb 4-5: SerialNumber: NM15KPXF
[18899.201278] scsi host0: uas
[18899.201746] scsi 0:0:0:0: Direct-Access     Seagate  M3 Portable      0710 PQ: 0 ANSI: 6
[18899.202513] sd 0:0:0:0: Attached scsi generic sg0 type 0
[18902.211236] sd 0:0:0:0: [sda] 1953525167 512-byte logical blocks: (1.00 TB/932 GiB)
[18902.211238] sd 0:0:0:0: [sda] 4096-byte physical blocks
[18902.211376] sd 0:0:0:0: [sda] Write Protect is off
[18902.211377] sd 0:0:0:0: [sda] Mode Sense: 53 00 00 08
[18902.211644] sd 0:0:0:0: [sda] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA
[18902.245795]  sda: sda1
[18902.247090] sd 0:0:0:0: [sda] Attached SCSI disk
[18902.719207] FAT-fs (sda1): Volume was not properly unmounted. Some data may be corrupt. Please run fsck.
lombardo@lombardo-Precision-M4800:~$

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sudo umount /dev/sdb1

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lombardo@lombardo-Precision-M4800:~$ sudo umount /dev/sdb1
[sudo] password di lombardo: 
umount: /: target is busy.
lombardo@lombardo-Precision-M4800:~$ 

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cd /var/tmp
sudo rm -r -f usbkey
sudo reboot