Unfortunately, I started out by installing rtl-sdr. Now, when I run my local copy of Stephen's rtl-sdr, I get
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Kernel driver is active, or device is claimed by second instance of librtlsdr. In the first case, please either detach or blacklist the kernel module (dvb_usb_rtl28xxu), or enable automatic detaching at compile time. usb_claim_interface error -6 Failed to open rtlsdr device #0.
What does it mean that the device is claimed by a second instance of librtlsdr? How do I control, which instance of librtlsdr can claim the device?