Penne USB non riconosciute

Buona sera, ho un desktop 64-bit con Ubuntu 16.04.1 LTS. Sono presenti porte usb a sufficienza posteriormente e anteriormente. Attualmente sono collegate, a porte USB, e funzionanti: la scheda di rete WiFi, il WiFi per collegare tastiera e mouse e il bluetooth. Se collego una penna usb il sistema non la vede. Se accendo il computer con la penna inserita mi dice che non può avviarsi perché non trova il SO. Se do il comando lsusb con la penna inserita il risultato è il seguente:

Bus 003 Device 003: ID 0b05:1723 ASUSTek Computer, Inc. WL-167G v2 802.11g Adapter [Ralink RT2571W]
Bus 003 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 007 Device 002: ID 046d:c52e Logitech, Inc. MK260 Wireless Combo Receiver
Bus 007 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 006 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 002 Device 004: ID 058f:6387 Alcor Micro Corp. Flash Drive
Bus 002 Device 002: ID 058f:6364 Alcor Micro Corp. AU6477 Card Reader Controller
Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 005 Device 002: ID 03f0:6004 Hewlett-Packard DeskJet 5550
Bus 005 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 004 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 009 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 008 Device 002: ID 1131:1004 Integrated System Solution Corp. Bluetooth Device
Bus 008 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub

senza:

Bus 003 Device 003: ID 0b05:1723 ASUSTek Computer, Inc. WL-167G v2 802.11g Adapter [Ralink RT2571W]
Bus 003 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 007 Device 002: ID 046d:c52e Logitech, Inc. MK260 Wireless Combo Receiver
Bus 007 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 006 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 002 Device 002: ID 058f:6364 Alcor Micro Corp. AU6477 Card Reader Controller
Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 005 Device 002: ID 03f0:6004 Hewlett-Packard DeskJet 5550
Bus 005 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 004 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 009 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 008 Device 002: ID 1131:1004 Integrated System Solution Corp. Bluetooth Device
Bus 008 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub

se do il comando:

sudo gedit /etc/modules

per modificare, mi esegue le modifiche ma ad ognuna compare nel terminale:

(gedit:4672): Gtk-WARNING **: Calling Inhibit failed: GDBus.Error:org.freedesktop.DBus.Error.ServiceUnknown: The name org.gnome.SessionManager was not provided by any .service files

Inserisco anche la parte rossa della risposta al comando "dmesg" sul terminale

[   34.940245] ata1.00: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x6 frozen
[   34.940295] ata1.00: failed command: IDENTIFY PACKET DEVICE
[   34.940342] ata1.00: cmd a1/00:01:00:00:00/00:00:00:00:00/00 tag 12 pio 512 in
                        res 40/00:00:00:00:00/00:00:00:00:00/00 Emask 0x4 (timeout)
[   34.940395] ata1.00: status: { DRDY }
[   34.940438] ata1: hard resetting link
[   35.432242] ata1: SATA link up 1.5 Gbps (SStatus 113 SControl 300)
[   36.234770] ata1.00: configured for UDMA/100
[   37.035597] ata1: EH complete
[   67.900705] ata1.00: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x6 frozen
[   67.900756] ata1.00: failed command: IDENTIFY PACKET DEVICE
[   67.900802] ata1.00: cmd a1/00:01:00:00:00/00:00:00:00:00/00 tag 23 pio 512 in
                        res 40/00:00:00:00:00/00:00:00:00:00/00 Emask 0x4 (timeout)
[   67.900854] ata1.00: status: { DRDY }

[  102.909163] ata1.00: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x6 frozen
[  102.909169] ata1.00: failed command: IDENTIFY PACKET DEVICE
[  102.909173] ata1.00: cmd a1/00:01:00:00:00/00:00:00:00:00/00 tag 13 pio 512 in
                        res 40/00:00:00:00:00/00:00:00:00:00/00 Emask 0x4 (timeout)
[  102.909176] ata1.00: status: { DRDY }
[  102.909178] ata1: hard resetting link

giorno 14 e 15 si è riavviato correttamente. Oggi no. Non so che fare, forse riinstallo tutto su un nuovo hd. saluti