Lenovo TAB2 A10-70F - device not supported

[DR]

calibre 2.57.1
Ubuntu Linux 14.04
SD card detected by Ubuntu, but device itself not detected by Ubuntu.

Debug device detection output:
calibre 2.57.1 embedded-python: True is64bit: True
Linux-3.13.0-86-generic-x86_64-with-debian-jessie-sid Linux ('64bit', 'ELF')
('Linux', '3.13.0-86-generic', '#131-Ubuntu SMP Thu May 12 23:33:13 UTC 2016')
Python 2.7.9
Linux: ('debian', 'jessie/sid', '')
USB devices on system:
[['0x17ef', '0x7898', '0xffff', u'MediaTek', u'Lenovo', u'RCHIKNOJ99999999'],
 ['0x45e',
  '0x7a5',
  '0x764',
  u'Microsoft',
  u'Microsoft\xae Nano Transceiver v2.1',
  u''],
 ['0x4f2',
  '0xb3f6',
  '0x2953',
  u'Chicony Electronics Co.,Ltd.',
  u'HD WebCam',
  u'0001'],
 ['0x1bcf', '0x5', '0x14', u'', u'USB Optical Mouse', u''],
 ['0x1c6b',
  '0xa220',
  '0x158',
  u'USB2.0 External',
  u'Mass Storage Device',
  u'00101016401008FC5'],
 ['0x8087', '0x7dc', '0x1', u'', u'', u'']]

No disabled plugins
Looking for devices of type: MTP_DEVICE
No MTP devices connected to system

Looking for devices of type: SMART_DEVICE_APP
All IP addresses {'lo': [{'netmask': '255.0.0.0', 'peer': '127.0.0.1', 'addr': '127.0.0.1'}], 'wlan0': [{'netmask': '255.255.255.0', 'broadcast': '192.168.0.255', 'addr': '192.168.0.12'}]}
No device is connected

Looking for devices...

Devices possibly connected: None

[Kovid Goyal (kovid)]

You need to put your tablet in "Media Transfer (MTP) mode" or if you
dont want to do that, you can always use the Connect to folder function
in calibre to conenct to a folder on the SD card as though it were a
device.

 status invalid