It seems a backporting conflict in update/upgrade (with apt-get) has been the 
problem.

After various daily upgradings, the things are fine again.

Why, ...? I don't know !

Had to do with Xorg and the sh command.

B4, to get out of the desktop back to tdm, i had to perform, as root from the 
console or from another ctrl+alt+Fx bash : killall Xorg or, better, killall 
sh .

That made me fall back to the tdm desktop manager.

But it was still with difficulties to shutdown the PC, which i achieved the 
hard way.

BRgds to all.

On Sunday 26 January 2020 02:50:34 David C. Rankin wrote:
> On 01/25/2020 11:48 AM, BorgLabs - Kate Draven wrote:
> > I'm late into this, so I maybe missing something... however...
> >
> > There are a couple of things I can think of to test things out.
> >
> > 1. Create a new user see if anything changes.
> > 2. Grab another HD, install and createa  new user. If you see some
> > improvement, copy the old user dir over and recreate the old users.
> >
> > Maybe it's a corrupted user dir or a bad HD?
>
> Only other thing I could thing of would be a bad/missing udev rule.