How do I debug a failed commit to github?

I'm new to git and github. My first commit of my project has failed. I'm probably doing something stupid.

I'd welcome anyone pointing out the stupid thing that I'm probably doing, but the worthier question is this: how can I find out what's going on here?

$ git remote add origin git@github.com:andy-twosticks/flungle.git

$ git push origin master
Enter passphrase for key '/home/andy/.ssh/id_rsa': 
ERROR: andy-twosticks/flungle.git doesn't exist. Did you enter it correctly?
fatal: The remote end hung up unexpectedly

$ git remote add origin git@github.com:andy-twosticks/Flungle.git
fatal: remote origin already exists.

$ git push origin master
Enter passphrase for key '/home/andy/.ssh/id_rsa开发者_运维技巧': 
ERROR: andy-twosticks/flungle.git doesn't exist. Did you enter it correctly?
fatal: The remote end hung up unexpectedly