Git, fatal: The remote end hung up unexpectedly

This is due to git/https buffer settings.

Run this (taken from Git fails when pushing commit to github):

git config http.postBuffer 524288000

Then, run your original command again.

This looks similar to How do I get github to default to ssh and not https for new repositories. Probably it's worth trying to switch from http protocol to ssh:

$ git remote add origin [email protected]:username/project.git

Cause: The default file post size for Git has been exceeded.

Solution: Navigate to repo. Run the following command to increase the buffer to 500MB after navigating to the repository:

git config http.postBuffer 524288000