Bug#878851: workaround for X bug
Dear Michael,
I had the same issue and I solved the problem by manually installing
libglvnd0 instead of libglvnd0-nvidia (which was automatically
installed during the upgrade).
Please note that libglvnd0-nvidia provides libglvnd0 and comes from the
non-free archive: I don't know why the non-free package was selected
instead of the main one.
Having done that, you can upgrade the system and X should work!
See also https://bugs.debian.org/876220
Regards,
Lorenzo Pinelli
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