I am still experiencing this issue as of now: marcos@S4X8-MANNY:~$ sudo apt-get update && sudo apt-get upgrade -y && uname -a Ign http://es.archive.ubuntu.com vivid InRelease Ign http://es.archive.ubuntu.com vivid-updates InRelease Ign http://es.archive.ubuntu.com vivid-backports InRelease Obj http://es.archive.ubuntu.com vivid Release.gpg Des:1 http://es.archive.ubuntu.com vivid-updates Release.gpg [933 B] Obj http://es.archive.ubuntu.com vivid-backports Release.gpg Obj http://es.archive.ubuntu.com vivid Release Des:2 http://es.archive.ubuntu.com vivid-updates Release [63,5 kB] Ign http://security.ubuntu.com vivid-security InRelease Obj http://security.ubuntu.com vivid-security Release.gpg Obj http://es.archive.ubuntu.com vivid-backports Release Obj http://es.archive.ubuntu.com vivid/main Sources Obj http://es.archive.ubuntu.com vivid/restricted Sources Obj http://security.ubuntu.com vivid-security Release Obj http://es.archive.ubuntu.com vivid/universe Sources Obj http://es.archive.ubuntu.com vivid/multiverse Sources Obj http://es.archive.ubuntu.com vivid/main amd64 Packages Obj http://es.archive.ubuntu.com vivid/restricted amd64 Packages Obj http://security.ubuntu.com vivid-security/main Sources Obj http://es.archive.ubuntu.com vivid/universe amd64 Packages Obj http://es.archive.ubuntu.com vivid/multiverse amd64 Packages Obj http://es.archive.ubuntu.com vivid/main i386 Packages Obj http://security.ubuntu.com vivid-security/restricted Sources Obj http://es.archive.ubuntu.com vivid/restricted i386 Packages Obj http://security.ubuntu.com vivid-security/universe Sources Obj http://es.archive.ubuntu.com vivid/universe i386 Packages Obj http://es.archive.ubuntu.com vivid/multiverse i386 Packages Obj http://security.ubuntu.com vivid-security/multiverse Sources Obj http://es.archive.ubuntu.com vivid/main Translation-es Obj http://es.archive.ubuntu.com vivid/main Translation-en Obj http://es.archive.ubuntu.com vivid/multiverse Translation-es Obj http://security.ubuntu.com vivid-security/main amd64 Packages Obj http://es.archive.ubuntu.com vivid/multiverse Translation-en Obj http://es.archive.ubuntu.com vivid/restricted Translation-es Obj http://security.ubuntu.com vivid-security/restricted amd64 Packages Obj http://es.archive.ubuntu.com vivid/restricted Translation-en Obj http://es.archive.ubuntu.com vivid/universe Translation-es Obj http://es.archive.ubuntu.com vivid/universe Translation-en Obj http://security.ubuntu.com vivid-security/universe amd64 Packages Des:3 http://es.archive.ubuntu.com vivid-updates/main Sources [9.756 B] Des:4 http://es.archive.ubuntu.com vivid-updates/restricted Sources [28 B] Obj http://security.ubuntu.com vivid-security/multiverse amd64 Packages Des:5 http://es.archive.ubuntu.com vivid-updates/universe Sources [3.044 B] Des:6 http://es.archive.ubuntu.com vivid-updates/multiverse Sources [28 B] Des:7 http://es.archive.ubuntu.com vivid-updates/main amd64 Packages [27,8 kB] Obj http://security.ubuntu.com vivid-security/main i386 Packages Des:8 http://es.archive.ubuntu.com vivid-updates/restricted amd64 Packages [28 B] Des:9 http://es.archive.ubuntu.com vivid-updates/universe amd64 Packages [10,3 kB] Obj http://security.ubuntu.com vivid-security/restricted i386 Packages Des:10 http://es.archive.ubuntu.com vivid-updates/multiverse amd64 Packages [28 B] Obj http://security.ubuntu.com vivid-security/universe i386 Packages Des:11 http://es.archive.ubuntu.com vivid-updates/main i386 Packages [27,8 kB] Des:12 http://es.archive.ubuntu.com vivid-updates/restricted i386 Packages [28 B] Obj http://security.ubuntu.com vivid-security/multiverse i386 Packages Des:13 http://es.archive.ubuntu.com vivid-updates/universe i386 Packages [10,4 kB] Des:14 http://es.archive.ubuntu.com vivid-updates/multiverse i386 Packages [28 B] Obj http://security.ubuntu.com vivid-security/main Translation-en Obj http://es.archive.ubuntu.com vivid-updates/main Translation-en Obj http://es.archive.ubuntu.com vivid-updates/multiverse Translation-en Obj http://es.archive.ubuntu.com vivid-updates/restricted Translation-en Obj http://security.ubuntu.com vivid-security/multiverse Translation-en Obj http://es.archive.ubuntu.com vivid-updates/universe Translation-en Obj http://es.archive.ubuntu.com vivid-backports/main Sources Obj http://security.ubuntu.com vivid-security/restricted Translation-en Obj http://es.archive.ubuntu.com vivid-backports/restricted Sources Obj http://es.archive.ubuntu.com vivid-backports/universe Sources Obj http://es.archive.ubuntu.com vivid-backports/multiverse Sources Obj http://es.archive.ubuntu.com vivid-backports/main amd64 Packages Obj http://es.archive.ubuntu.com vivid-backports/restricted amd64 Packages Obj http://es.archive.ubuntu.com vivid-backports/universe amd64 Packages Obj http://security.ubuntu.com vivid-security/universe Translation-en Obj http://es.archive.ubuntu.com vivid-backports/multiverse amd64 Packages Obj http://es.archive.ubuntu.com vivid-backports/main i386 Packages Obj http://es.archive.ubuntu.com vivid-backports/restricted i386 Packages Obj http://es.archive.ubuntu.com vivid-backports/universe i386 Packages Obj http://es.archive.ubuntu.com vivid-backports/multiverse i386 Packages Obj http://es.archive.ubuntu.com vivid-backports/main Translation-en Obj http://es.archive.ubuntu.com vivid-backports/multiverse Translation-en Obj http://es.archive.ubuntu.com vivid-backports/restricted Translation-en Obj http://es.archive.ubuntu.com vivid-backports/universe Translation-en Descargados 154 kB en 15s (9.634 B/s) Leyendo lista de paquetes... Hecho Leyendo lista de paquetes... Hecho Creando árbol de dependencias Leyendo la información de estado... Hecho Calculando la actualización... Listo 0 actualizados, 0 nuevos se instalarán, 0 para eliminar y 0 no actualizados. Linux S4X8-MANNY 3.19.0-15-generic #15-Ubuntu SMP Thu Apr 16 23:32:37 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux marcos@S4X8-MANNY:~$ date lun may 4 15:51:47 CEST 2015 marcos@S4X8-MANNY:~$ Dmesg: [ 382.651086] usb 2-1: new SuperSpeed USB device number 2 using xhci_hcd [ 382.670760] usb 2-1: New USB device found, idVendor=0781, idProduct=5580 [ 382.670778] usb 2-1: New USB device strings: Mfr=1, Product=2, SerialNumber=3 [ 382.670787] usb 2-1: Product: Extreme [ 382.670795] usb 2-1: Manufacturer: SanDisk [ 382.670802] usb 2-1: SerialNumber: AA010122141450271936 [ 382.758883] usb-storage 2-1:1.0: USB Mass Storage device detected [ 382.769656] scsi host1: usb-storage 2-1:1.0 [ 382.770632] usbcore: registered new interface driver usb-storage [ 382.789612] usbcore: registered new interface driver uas [ 383.768238] scsi 1:0:0:0: Direct-Access SanDisk Extreme 0001 PQ: 0 ANSI: 6 [ 383.769037] sd 1:0:0:0: Attached scsi generic sg1 type 0 [ 383.774253] sd 1:0:0:0: [sdb] 30651688 512-byte logical blocks: (15.6 GB/14.6 GiB) [ 383.775283] sd 1:0:0:0: [sdb] Write Protect is off [ 383.775299] sd 1:0:0:0: [sdb] Mode Sense: 33 00 00 08 [ 383.775818] sd 1:0:0:0: [sdb] Write cache: disabled, read cache: enabled, doesn't support DPO or FUA [ 383.782895] sdb: sdb1 [ 383.784832] sd 1:0:0:0: [sdb] Attached SCSI disk [ 953.311706] usb 2-1: reset SuperSpeed USB device number 2 using xhci_hcd [ 953.328516] xhci_hcd 0000:00:10.0: xHCI xhci_drop_endpoint called with disabled ep ffff8800446d2e40 [ 953.328535] xhci_hcd 0000:00:10.0: xHCI xhci_drop_endpoint called with disabled ep ffff8800446d2e88 [ 953.449884] usb 2-1: reset SuperSpeed USB device number 2 using xhci_hcd [ 953.700878] xhci_hcd 0000:00:10.0: xHCI xhci_drop_endpoint called with disabled ep ffff8800446d2e40 [ 953.700898] xhci_hcd 0000:00:10.0: xHCI xhci_drop_endpoint called with disabled ep ffff8800446d2e88 [ 1440.567515] usb 2-1: device not accepting address 2, error -22 [ 1441.087950] usb 2-1: USB disconnect, device number 2 [ 1441.093257] sd 1:0:0:0: [sdb] FAILED Result: hostbyte=DID_NO_CONNECT driverbyte=DRIVER_OK [ 1441.093274] sd 1:0:0:0: [sdb] CDB: [ 1441.093282] Read(10): 28 00 00 fa 04 c0 00 00 02 00 [ 1441.093309] blk_update_request: I/O error, dev sdb, sector 16385216 [ 1441.120102] xhci_hcd 0000:00:10.0: xHCI xhci_drop_endpoint called with disabled ep ffff8800446d2e40 [ 1441.120119] xhci_hcd 0000:00:10.0: xHCI xhci_drop_endpoint called with disabled ep ffff8800446d2e88