Mike Bird wrote:

> FWIW I'm not seeing that with several sysvinit Busters - mostly amd64
> or multiarch but also at least one very very slow 192MB i386 test box.

It is a known bug - I do not recall which one, but the essence is that in 

/lib/systemd/system/tdm.service

you should remove 

Conflicts=getty@... plymouth-quit.service

or just comment it out. Then systemd will shutdown tdm properly

regards