Can't set up repos for development. Permission denied

[roschler]

• I've asked for help in the Truffle Gitter before filing this issue.

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The Contributing.md document tells you to use the git@github protocol for fetching repos. Every time I use that protocol I get a permission denied error:

reselect-tree:
Cloning into 'dependencies/reselect-tree'...
git@github.com: Permission denied (publickey).
fatal: Could not read from remote repository.

Please make sure you have the correct access rights
and the repository exists.

I tried to go around it by using the "https://" URL for the main repo. I was able to clone that repo but ran into the exact same problem again when I executed the meta utility to get the dependent repos, because that utility also uses the git@github protocol. I'm running Ubuntu Bionic Beaver 18.04 LTS, fully patched.

[roschler]

Found the problem. I had to set up an RSA key for my GitHub account. Now I can use the git@github.com links. These two documents showed me how:

https://help.github.com/articles/generating-a-new-ssh-key-and-adding-it-to-the-ssh-agent/#adding-your-ssh-key-to-the-ssh-agent
https://help.github.com/articles/adding-a-new-ssh-key-to-your-github-account/