On Tuesday 03 July 2018 15.49:06 Stefan Krusche wrote:
> Good day everyone,
(...)
> Through the most recent upgrade, that I executed on 2018-07-02 11:42:01,
> tdm (amongst a couple others) got upgraded:
(...)
> After this upgrade tdm wouldn't start anymore and in /var/log/boot I found
> this error message:
(...)
> Solution:
>
> $ dpkg-reconfigure tdm-trinity
(...)
> Has anybody seen this? Do you think it is a bug?
>
> Regards,
> Stefan

Debian Stretch here. Same thing happened with tha last update/upgrade

Obviously Debian/Devuan got updated too and reset the display manager. As far 
as I am concerned it's not a bug, just an result of the distribution not 
respecting modifications by the user and going back to some config file it 
used for it's own setup.

I my case I found myself loging in from Gnome again.

Thierry