xserver-common and xserver-xorg-core are trying to update in SID today ... you must stop this from happening or risk your system tanking...
If you do an dist-upgrade, those packages will update but you will not be able to boot to a DE login, only a tty1. If you try to reinstall xorg, you will be met with:
fails due to depends on xorg-video-abi-14 but it is not installable
To get by this until it is resolved simply put xserver-common and xserver-xorg-core on hold like this:
sudo apt-mark hold xserver-common
sudo apt-mark hold xserver-xorg-core
And look back here until this is cleared...
EDIT - This has been cleared and resolved in Debian packaging
Run
sudo apt-mark unhold xserver-common
sudo apt-mark unhold xserver-xorg-core
sudo apt-get update && sudo apt-get dist-upgrade
and programming will resume back to normal channels
This has been cleared and resolved in Debian packaging
Run
sudo apt-mark unhold xserver-common
sudo apt-mark unhold xserver-xorg-core
sudo apt-get update && sudo apt-get dist-upgrade
and programming will resume back to normal channels