Hello all,

Debian 9 here. Today I updated things (I used synaptic - Mark all upgrades. 
That was perhaps an error). Many things got updated, included Trinity stuff.

The problem is it also reverted the DM to gdm3. I changed it 
to /opt/trinity/bin/tdm, but the result is that the system does not start, 
with

Failed to start Gnome Display Manager
See 'systemctl status gdm.service' for details

Is there a way to get TDM back?

Thierry