Hi Marcin, On 11/10/2021 15.34, Marcin Puchlik wrote: > *sudo apt-get purge --auto-remove gnuradio*
This is not enough > libgnuradio-runtime3.8.1:amd64 3.8.1.0-0~gnuradio~focal-6 > amd64 gnuradio core runtimeii > libgnuradio-runtime3.8.2:amd64 3.8.2.0-0~gnuradio~focal-2 > amd64 gnuradio You still have some 3.8.2 packages > Which look correct for me, Try with apt-get remove gnuradio gnuradio-dev "libgnuradio*" And then before reinstalling check that you don't have any libgnuradio package installed. Here is the full list of gnuradio packages installed in the container where I successfully built your OOT howto project. $ dpkg -l | grep gnuradio ii gnuradio 3.8.1.0~rc1-2build2 amd64 GNU Radio Software Radio Toolkit ii gnuradio-dev:amd64 3.8.1.0~rc1-2build2 amd64 GNU Software Defined Radio toolkit development ii libgnuradio-analog3.8.1:amd64 3.8.1.0~rc1-2build2 amd64 gnuradio analog functions ii libgnuradio-audio3.8.1:amd64 3.8.1.0~rc1-2build2 amd64 gnuradio audio functions ii libgnuradio-blocks3.8.1:amd64 3.8.1.0~rc1-2build2 amd64 gnuradio blocks functions ii libgnuradio-channels3.8.1:amd64 3.8.1.0~rc1-2build2 amd64 gnuradio channels functions ii libgnuradio-digital3.8.1:amd64 3.8.1.0~rc1-2build2 amd64 gnuradio digital communications functions ii libgnuradio-dtv3.8.1:amd64 3.8.1.0~rc1-2build2 amd64 gnuradio digital TV signal processing blocks ii libgnuradio-fec3.8.1:amd64 3.8.1.0~rc1-2build2 amd64 gnuradio forward error correction support ii libgnuradio-fft3.8.1:amd64 3.8.1.0~rc1-2build2 amd64 gnuradio fast Fourier transform functions ii libgnuradio-filter3.8.1:amd64 3.8.1.0~rc1-2build2 amd64 gnuradio filter functions ii libgnuradio-pmt3.8.1:amd64 3.8.1.0~rc1-2build2 amd64 gnuradio pmt container library ii libgnuradio-qtgui3.8.1:amd64 3.8.1.0~rc1-2build2 amd64 gnuradio Qt graphical user interface functions ii libgnuradio-runtime3.8.1:amd64 3.8.1.0~rc1-2build2 amd64 gnuradio core runtime ii libgnuradio-trellis3.8.1:amd64 3.8.1.0~rc1-2build2 amd64 gnuradio trellis modulation functions ii libgnuradio-uhd3.8.1:amd64 3.8.1.0~rc1-2build2 amd64 gnuradio universal hardware driver functions ii libgnuradio-video-sdl3.8.1:amd64 3.8.1.0~rc1-2build2 amd64 gnuradio video functions ii libgnuradio-vocoder3.8.1:amd64 3.8.1.0~rc1-2build2 amd64 gnuradio vocoder functions ii libgnuradio-wavelet3.8.1:amd64 3.8.1.0~rc1-2build2 amd64 gnuradio wavelet functions ii libgnuradio-zeromq3.8.1:amd64 3.8.1.0~rc1-2build2 amd64 gnuradio zeromq functions Regards, Vasil