... and it turns out that, indeed, Ubuntu version was the one to upgrade in order to install the latest drivers via apt and have everything running smooth without the need to do my rebuild hack.
Of course, my release upgrade totally failed with the "Oh No" message and I lost my installation of kstars and indi.
Just has to re-apply standard procedure:

sudo apt-add-repository ppa:mutlaqja/ppa
sudo apt-get update
sudo apt-get install indi-full gsc
sudo apt-get install indi-full kstars-bleeding

as mentioned here: indilib.org/download

I could retrieve all my settings and everything works as expecting now

Ps: As a check of the symptoms, now, the "standard" indi_gphoto_ccd has been linked with libraw20:
(base) deneb-l@astroserv:~$ ldd /usr/bin/indi_gphoto_ccd | grep libraw
libraw.so.20 => /lib/x86_64-linux-gnu/libraw.so.20 (0x00007fc986dc3000)

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