Ubuntu 16.04 and ppa repository

[Nico Aliotta]

Michael Maurizi sayd that was better to use ubuntu 16.04 but when i try to add ppa repository:

add-apt-repository ppa:chris-lea/node.js

Failed to fetch http://ppa.launchpad.net/chris-lea/node.js/ubuntu/dists/xenial/main/binary-amd64/Packages  404  Not Found

E: Some index files failed to download. They have been ignored, or old ones used instead.

Is there another repository to use? or is changed something from the instruction guide?

[Nico Aliotta]

another question:

python opentreemap/manage.py collectstatic --noinput --clean

usage: manage.py collectstatic [-h] [--version] [-v {0,1,2,3}]
                               [--settings SETTINGS] [--pythonpath PYTHONPATH]
                               [--traceback] [--no-color] [--noinput]
                               [--no-post-process] [-i PATTERN] [-n] [-c] [-l]
                               [--no-default-ignore]
manage.py collectstatic: error: unrecognized arguments: --clean

what is wrong with --clean? 

[Justin Walgran]

The option is --clear, not --clean.

https://docs.djangoproject.com/en/1.8/ref/contrib/staticfiles/#django-admin-option---clear

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