On Wed June 6 2018 20:30:13 Mike Bird wrote:
> Not sure yet whether this was my mistake or a bug in some package.

TLDR: Not a TDE problem.

This system has an old Nvidia card.  The installation is multiarch.
When upgrading from Jessie to Stretch the primary arch was converted
from nvidia (current) to nvidia-legacy but I forgot to convert a
foreign arch to match.  This confused the glx-diversions mechanism
resulting in the omission of one of the five layers of symlinks for
libGL.so.1 for the primary arch.  Upon switching the foreign arch
to nvidia-legacy the missing primary arch symlink was created.

--Mike