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Hello Al. Happy New Year!

I am using Linux Mint 15 (Olivia), an Ubuntu fork, with a Realtek RTL2832U-based dongle and when I try to run the scanner program by typing:
./rtlsdr_scan.py --start 100 --end 102 test.rfs (From your example above)
I first get a warning:
***************************************************************************************************
/usr/lib/pymodules/python2.7/matplotlib/__init__.py:1035: UserWarning: This call to matplotlib.use() has no effect
because the the backend has already been chosen;
matplotlib.use() must be called *before* pylab, matplotlib.pyplot,
or matplotlib.backends is imported for the first time.
***************************************************************************************************

And then this output:
***************************************************************************************************
warnings.warn(_use_error_msg)
RTLSDR Scanner

Detached kernel driver
Found Elonics E4000 tuner
Traceback (most recent call last):
File "./rtlsdr_scan.py", line 89, in <module>
frame = FrameMain("RTLSDR Scanner", pool)
File "/home/mike/RTLSDR-Scanner-master/src/main_window.py", line 135, in __init__
self.devices = get_devices(self.settings.devices)
File "/home/mike/RTLSDR-Scanner-master/src/devices.py", line 71, in get_devices
device.gains = sdr.valid_gains_db
AttributeError: 'RtlSdr' object has no attribute 'valid_gains_db'
Reattached kernel driver
***************************************************************************************************

Any idea what I am missing or doing wrong?

Any info is greatly appreciated!
Mike