Can't get GNU Radio/PlutoSDR and gqrx/PlutoSDR to both work on Ubuntu

I can install GNU Radio as described here and make it work with the Pluto SDR.

https://wiki.analog.com/resources/tools-software/linux-software/gnuradio#using_the_plutosdr_blocks

I can install gqrx as described here and make it work with the Pluto SDR.

https://gqrx.dk/download/install-ubuntu

However, the gqrx installation breaks the GNU Radio installation.

GNU Radio complains:

ImportError: No module named _iio_swig

What do I need to do to have both apps working?