I broke my Nvidia install by doing a d-u last weekend.
1. I hadn't done a d-u in a month, so I thought I should upgrade
2. I had installed the proprietary nvidia driver using the recommended debian method. (update, then install nvidia-driver).
3. It had been working fine.
4. The d-u aborted after installing a new kernel and rebuilding / installing the updated boot image.
5. X wouldn't start on reboot. startx wouldn't work either.
6. For some reason xorg-driver-video-nvidia (version 375.82-4) was only partially installed.
7. I spent a couple hours trying to find out what was broken. The usual problems with package dependencies which "aren't going to be installed". Rumors that the nvidia drivers were broken in Sid and needed to be installed from experimental.
8. I decided to force a re-install of xorg-driver-video-nvidia and that seems to have fixed the broken dependencies.
9. X starts on reboot, but the keyboard and mouse aren't working. I assume I need to run a reconfigure on some component to fix that up.
Has anyone else seen this?
BTW: Several times (including the latest attempt) when I've tried to d-u, 'sddm' is either not found, not upgraded or de-selected in favor of gdm or every other display manager. What's going on here?