[SOLVED]Re: Partition unreadable [was: Re: Debian Stretch broken !]

[Bernard <bdebreil@free.fr>]

Le 09/04/2020 20:11, Greg Wooledge a écrit :
> On Thu, Apr 09, 2020 at 08:04:31PM +0200, Bernard wrote:
> > [ 15541.577] (EE) AIGLX error: dlopen of
> > /usr/lib/x86_64-linux-gnu/dri/nouveau_dri.so failed
> > (/usr/lib/x86_64-linux-gnu/dri/nouveau_dri.so: cannot open shared object
> > file: No such file or directory)
>
> You're missing the libgl1-mesa-dri package (or it's partly installed, or
> corrupted...).  In any case, try reinstalling libgl1-mesa-dri.

That did the trick !! After that package reinstalled, a return to user 
mode and

$ startx

did boot to the gnome desktop I'd lost 6 days ago, everything was there 
working all right. I logged out and booted again the usual way: 
everything was fine. I will never know how that driver got damaged.

Thanks a lot to you and to everyone who helped me solving that problem.

Bernard