We all know that the output device for sound can be configured manually from
Settings > Sound > Output Device > <Dropdown List>
But it's very tiresome to see the device selected changed each time we restart the PC. For some strange reason my PC has defaulted to my mobile phone lately !
[I'd like to present a screenshot of this new addition to my sound output device list. But my screenshot generator (basically, press the Print Screen button on the keyboard) just does not function when a dropdown menu is shown ... Thanks, Ubuntu. ]
With all other configurations the selected options are stored and applied on reboot - but not with the sound output device.
So is there a .conf file somewhere into which I can inscribe a favored output device ?