extlib/README mentions a package.json file that doesn't seem to exist. The commit message is "WIP" by Asheesh, so possibly this was something never completed? We should ask Asheesh. Currently the JavaScript dependencies are installed from bower.json.

during upgrade on a debian stretch up to date (I've redone all the step on a fresh buster and ended at the same place), there were an issue during configure on the following step: ./bin/python setup.py develop --upgrade

when trying to install MarkupSafe, minimum version required by egg file was minimum 0.23, thus 2.0.0a was installed, which failed. as a workarond, egg file has been modified to force version 1.1.1 which is stable to be installed. Configure was fine from there.

Then, upgrade failed because a previously installed plugin (mediagoblin_private) was not found anymore. After reinstallation, all was ok. I believe documentation should precise to either deactivate plugin during upgrade, or reinstall them before proceed at a suitable step.