Comment 7 for bug 1907920

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.