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Hi, I managed to install everything as stated on your doc but nothing will be plotted :(
it gave me this on console:

% ./rtlsdr_scan.py
/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.

warnings.warn(_use_error_msg)
RTLSDR Scanner

Found Rafael Micro R820T tuner
Found Rafael Micro R820T tuner
Found Rafael Micro R820T tuner
Exact sample rate is: 2000000.052982 Hz
Traceback (most recent call last):
File "/home/asbesto/Desktop/src/gnuradio/rtlsdrscanner/RTLSDR-Scanner-master/src/main_window.py", line 521, in on_event
self.progress()
File "/home/asbesto/Desktop/src/gnuradio/rtlsdrscanner/RTLSDR-Scanner-master/src/main_window.py", line 634, in progress
self.plot.annotate_plot()
File "/home/asbesto/Desktop/src/gnuradio/rtlsdrscanner/RTLSDR-Scanner-master/src/plot.py", line 175, in annotate_plot
y = max(data[1])
ValueError: max() arg is an empty sequence

here is a Linux Mint on a MSI U100 netbook :)

Any help? Thank you! :)