I can now confirm that this missing 32-bit library is in fact the problem.
I downloaded bluez-audio_3.26-0ubuntu6_i386.deb and manually extracted the files libasound_module_ctl_bluetooth.so and libasound_module_pcm_bluetooth.so into /usr/lib32/alsa-lib. It works.
I can now confirm that this missing 32-bit library is in fact the problem.
I downloaded bluez-audio_ 3.26-0ubuntu6_ i386.deb and manually extracted the files libasound_ module_ ctl_bluetooth. so and libasound_ module_ pcm_bluetooth. so into /usr/lib32/ alsa-lib. It works.