Looking for devices...
USBDevice(busnum=3, devnum=9, vendor_id=0x1949, product_id=0x0004, bcd=0x0100, manufacturer=Amazon, product=Amazon Kindle, serial=GXXXXXX573840D0X)

Detected possible device KINDLE2

Devices possibly connected: Kindle 2/3/4/Touch/PaperWhite/Voyage Device Interface,  
Trying to open Kindle 2/3/4/Touch/PaperWhite/Voyage Device Interface ...

Found device nodes: /dev/sda1 None None

Udisks mount call failed:

Traceback (most recent call last):
  File "/usr/lib/calibre/calibre/devices/usbms/device.py", line 562, in do_mount
    mount(node)
  File "/usr/lib/calibre/calibre/devices/udisks.py", line 140, in mount
    u.mount(node_path)
  File "/usr/lib/calibre/calibre/devices/udisks.py", line 102, in mount
 msg = self.filesystem_operation_message(device_node_path, 'Mount', options=('s', ','.join(basic_mount_options())))
  File "/usr/lib/calibre/calibre/devices/udisks.py", line 96, in filesystem_operation_message
    devname = self.device(device_node_path)
  File "/usr/lib/calibre/calibre/devices/udisks.py", line 92, in device
    raise KeyError(f'{device_node_path} not known to UDisks2')

KeyError: '/dev/sda1 not known to UDisks2'

Found device nodes: /dev/sda1 None None

Udisks mount call failed:
Traceback (most recent call last):
File "/usr/lib/calibre/calibre/devices/usbms/device.py", line 713, in open
    self.open_linux()
  File "/usr/lib/calibre/calibre/devices/usbms/device.py", line 587, in open_linux
    raise DeviceError(
calibre.devices.errors.DeviceError: Unable to mount main memory (Error code: 1)

During handling of the above exception, another exception

occurred:

Traceback (most recent call last):
  File "/usr/lib/calibre/calibre/devices/usbms/device.py", line 562, in do_mount
    mount(node)
  File "/usr/lib/calibre/calibre/devices/udisks.py", line 140, in mount
    u.mount(node_path)
 File "/usr/lib/calibre/calibre/devices/udisks.py", line 102, in mount
    msg = self.filesystem_operation_message(device_node_path, 'Mount', options=('s', ','.join(basic_mount_options())))
  File "/usr/lib/calibre/calibre/devices/udisks.py", line 96, in filesystem_operation_message
    devname = self.device(device_node_path)
File "/usr/lib/calibre/calibre/devices/udisks.py", line 92, in device
    raise KeyError(f'{device_node_path} not known to UDisks2')

KeyError: '/dev/sda1 not known to UDisks2'
failed

Opening of the following devices failed
<calibre.devices.kindle.driver.KINDLE2 object at 0x6308f5e8c940>
Traceback (most recent call last):
File "/usr/lib/calibre/calibre/devices/usbms/device.py", line 713, in open
    self.open_linux()
  File "/usr/lib/calibre/calibre/devices/usbms/device.py", line 587, in open_linux
    raise DeviceError(
calibre.devices.errors.DeviceError: Unable to mount main memory (Error code: 1)

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/usr/lib/calibre/calibre/devices/__init__.py", line 163, in debug
    dev.open(det, None)
  File "/usr/lib/calibre/calibre/devices/usbms/device.py", line 716, in open
    self.open_linux()
File "/usr/lib/calibre/calibre/devices/usbms/device.py", line 587, in open_linux
    raise DeviceError(
calibre.devices.errors.DeviceError: Unable to mount main memory (Error code: 1)