[stvs]

Fixed it. Behind a firewall, you must use 'sudo -E' to preserve the http_proxy and https_proxy environment variables, like this:

sudo -E -v && wget -nv -O- https://raw.githubusercontent.com/ko...x-installer.py | sudo -E python -c "import sys; main=lambda:sys.stderr.write('Download failed\n'); exec(sys.stdin.read()); main()"