You may sometimes get an error saying
Cannot clone this lesson right now. Please try again.
If you see this error, check your permissions with github by typing in
ssh -T firstname.lastname@example.org. If you get back
Permission denied (publickey)., you'll need to add your SSH key to github.
If you got back something like
Hi <github-username>! You've successfully authenticated, but GitHub does not provide shell access. then your SSH key is properly setup and you should try manually cloning the lab using the
git clone command. (Note: You should use the SSH link instead of the HTTP link when cloning).