Node 13.x on Ubuntu 18.04 using WSL with proxy

[connorpwilliams]

I have Windows Subsystem for Linux (WSL) running Ubuntu 18.04 bionic

Ran this command taken from README
curl -sL https://deb.nodesource.com/setup_13.x (proxy info hidden) | sudo -E bash -

Received this error:

## Your distribution, identified as "bionic", is not currently supported, please contact NodeSource at https://github.com/nodesource/distributions/issues if you think this is incorrect or would like your distribution to be considered for support

Wondering if this is related to WSL?

[connorpwilliams]

Relates to #850 and #828

[connorpwilliams]

Issue was with proxy

Had to replace setup script curl lines to add proxy

Also had to update apt.conf with proxy info to have deb commands from setup script work.