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I am running Ubuntu 22.04 Raspberry Pi 4 The question is that how do I make it not out put that error. Note, I did summit a bug report here

rtl_test output

Found 1 device(s):
  0:  , �bߧ��, SN: @�ާ��

Using device 0: Generic RTL2832U OEM
usb_open error -3
Please fix the device permissions, e.g. by installing the udev rules file rtl-sdr.rules
Failed to open rtlsdr device #0.

lsusb output

Bus 003 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 001 Device 004: ID 0bda:2838 Realtek Semiconductor Corp. RTL2838 DVB-T
Bus 001 Device 002: ID 2109:3431 VIA Labs, Inc. Hub
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
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1 Answer 1

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if you have only access with grandet rights (sudo) to an device you can grep recursive in udev rules.d for your device (device-id or vendor-id). Here

grep -r 2838 /usr/lib/udev/rules.d/
/usr/lib/udev/rules.d/60-librtlsdr0.rules:SUBSYSTEMS=="usb", ATTRS{idVendor}=="0bda", ATTRS{idProduct}=="2838", ENV{ID_SOFTWARE_RADIO}="1", MODE="0660", GROUP="plugdev"

the device "belongs" to group plugdev here. So your user has to be in group plugdev (here).

Sorry not good in explaining in english.

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