Explain how to make npm -g installs work on Ubuntu.

[mkohler]

Explain how to configure npm for global installs, for Linux users who don't have lots of npm experience.

[jdhorwitz]

Would a link to using NVM be preferable in either addition or replacement? Solves this issue with additional benefits.

[mkohler]

Looking into this a bit deeper, it looks like we need separate instructions for the different versions of Ubuntu. Just considering LTS releases, Ubuntu 16.04 requires the nodejs-legacy package, but 18.04 doesn't have such a package. The Ubuntu 14.04 LTS nodejs package is v0.10.25, which I don't think is compatible with Elm.

@jdhorwitz I haven't used NVM. Would that be a good choice for someone on Ubuntu 14.04? And for the other Ubuntu versions, if you're not already an NVM user, and you are just trying to install Elm, what are the benefits of using NVM to install node?

I couldn't find a resource that says which versions of node are compatible with Elm.