Nexus 10 problems

Hi folks,
I'm a 73 year old wanna-be geek so I really don't know what I'm doing. Did an upgrade from Ubuntu 12.04 to 14.04 and now Calibre 1.48 does not show my Nexus 10. Have attached debug detection. Any help would be fantastic. Thank you.calibre 1.48 isfrozen: True is64bit: True
Linux-3.13.0-34-generic-x86_64-with-debian-jessie-sid Linux ('64bit', 'ELF')
('Linux', '3.13.0-34-generic', '#60-Ubuntu SMP Wed Aug 13 15:45:27 UTC 2014')
Python 2.7.5
Linux: ('debian', 'jessie/sid', '')
USB devices on system:
[['0x3f0',
'0x4512',
'0x100',
u'HP',
u'Officejet 6500 E709n',
u'TH03K221Y605G2'],
['0x45e',
'0x9d',
'0x41',
u'Microsoft',
u'Microsoft Wireless Optical Desktop\xae 2.10',
u''],
['0x46d', '0xc52b', '0x1201', u'Logitech', u'USB Receiver', u''],
['0x18d1', '0x4ee1', '0x226', u'samsung', u'Nexus 10', u'R32CB06ZD6D']]

No disabled plugins
Looking for devices of type: MTP_DEVICE
MTP devices connected:
USBDevice(busnum=2, devnum=7, vendor_id=0x18d1, product_id=0x4ee1, bcd=0x0226, manufacturer=samsung, product=Nexus 10, serial=R32CB06ZD6D)

Trying to open: USBDevice(busnum=2, devnum=7, vendor_id=0x18d1, product_id=0x4ee1, bcd=0x0226, manufacturer=samsung, product=Nexus 10, serial=R32CB06ZD6D)
Opening device failed:
Traceback (most recent call last):
File "site-packages/calibre/devices/mtp/unix/driver.py", line 127, in debug_managed_device_detection
File "site-packages/calibre/devices/mtp/driver.py", line 123, in open
File "site-packages/calibre/devices/mtp/base.py", line 24, in synchronizer
File "site-packages/calibre/devices/mtp/unix/driver.py", line 196, in open
OpenFailed: Failed to open USBDevice(busnum=2, devnum=7, vendor_id=0x18d1, product_id=0x4ee1, bcd=0x0226, manufacturer=samsung, product=Nexus 10, serial=R32CB06ZD6D): Error: Unable to open raw device.


Looking for devices...

Devices possibly connected: None