I'm quoting the output of the commands you sent me. The output is the same before and after deleting the cache. So they don't point at the source of the issue.
address@hidden:~/src/poanetwork/hbbft$ sudo ldconfig -v | grep gnuradio
ldconfig: Can't stat /usr/lib/digilent/adept: No such file or directory
ldconfig: Can't stat /usr/local/lib/i386-linux-gnu: No such file or directory
ldconfig: Can't stat /usr/local/lib/i686-linux-gnu: No such file or directory
ldconfig: Can't stat /lib/i686-linux-gnu: No such file or directory
ldconfig: Can't stat /usr/lib/i686-linux-gnu: No such file or directory
ldconfig: Can't stat /usr/local/lib/x86_64-linux-gnu: No such file or directory
ldconfig: Path `/lib/x86_64-linux-gnu' given more than once
ldconfig: Path `/usr/lib/x86_64-linux-gnu' given more than once
ldconfig: /lib/i386-linux-gnu/
ld-2.27.so is the dynamic linker, ignoring
libgnuradio-iio.so.0 -> libgnuradio-iio.so.0.2
libgnuradio-vocoder-3.7.11.1.so.0.0.0 -> libgnuradio-vocoder.so
libgnuradio-channels-3.7.11.1.so.0.0.0 -> libgnuradio-channels.so
libgnuradio-fcd-3.7.11.1.so.0.0.0 -> libgnuradio-fcd.so
libgnuradio-uhd-3.7.11.1.so.0.0.0 -> libgnuradio-uhd.so
libgnuradio-blocks-3.7.11.1.so.0.0.0 -> libgnuradio-blocks.so
libgnuradio-digital-3.7.11.1.so.0.0.0 -> libgnuradio-digital.so
libgnuradio-trellis-3.7.11.1.so.0.0.0 -> libgnuradio-trellis.so
libgnuradio-wavelet-3.7.11.1.so.0.0.0 -> libgnuradio-wavelet.so
libgnuradio-fec-3.7.11.1.so.0.0.0 -> libgnuradio-fec.so
libgnuradio-runtime-3.7.11.1.so.0.0.0 -> libgnuradio-runtime.so
libgnuradio-zeromq-3.7.11.1.so.0.0.0 -> libgnuradio-zeromq.so
libgnuradio-analog-3.7.11.1.so.0.0.0 -> libgnuradio-analog.so
libgnuradio-comedi-3.7.11.1.so.0.0.0 -> libgnuradio-comedi.so
libgnuradio-pmt-3.7.11.1.so.0.0.0 -> libgnuradio-pmt.so
libgnuradio-fft-3.7.11.1.so.0.0.0 -> libgnuradio-fft.so
libgnuradio-filter-3.7.11.1.so.0.0.0 -> libgnuradio-filter.so
libgnuradio-dtv-3.7.11.1.so.0.0.0 -> libgnuradio-dtv.so
libgnuradio-video-sdl-3.7.11.1.so.0.0.0 -> libgnuradio-video-sdl.so
ldconfig: /lib/x86_64-linux-gnu/
ld-2.27.so is the dynamic linker, ignoring
ldconfig: /lib32/
ld-2.27.so is the dynamic linker, ignoring