Linux MX 19 AHS; plus another question on X server failure with nVidia drivers

1)
What AHS acronym stands for ?
I'm doubtful which version to dnls (patito feo) "plain" vs AHS.

on allacronym I find misterious things like
Advanced Habbo Security
(which, if ever was the correct one, does not explain 
nothing to me).

tnx for any clarification


2)
my existing MX (18.3) version, not used for 69 days, now 
refuses to run X
(complaining about nVidia drivers, but I cannot capture 
manually the long and vague, to me, screens).
It let me login in a text terminal but StartX command fails.

How could I restore manually the nouveau driver ?
(either from inside "live" MX console or from outside, from 
this same machine where I run Debian Stretch as main distro 
and I "see" MX partition .... are there some config files to 
edit and restore NOUVEAU default driver and see if this 
solve X server problem ?)




-- 
1) Resistere, resistere, resistere.
2) Se tutti pagano le tasse, le tasse le pagano tutti
Soviet_Mario - (aka Gatto_Vizzato)