Blocking packages:
python-gi
openscenegraph (and libraries)
libcamera-info-manager-dev (and dependencies)
libroscpp-dev
libxmlrpcpp-dev
libb64-dev

After that, upgrading was unblocked.
It doesn't make a lot of sense why the above would be a problem, except 
python-gi maybe as it was python2.7 dependent.
Most have since been reinstalled with newer versions.  Somehow it couldn't 
detect this path, but there was no issue with installing the upgraded packages 
back in.

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https://bugs.launchpad.net/bugs/1907920

Title:
  An unresolvable problem occurred while calculating the upgrade

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