"git@github.com: Permission denied (publickey)"

[wyardley]

"git@github.com: Permission denied (publickey)." on repo that previously worked

If you have received “git@github.com: Permission denied (publickey).” Please click “project settings” button, than “SSH keys”. Click to remove deploy key and than click “add deploy key” once again. Than you can click on “${project} deploy key”, it will navigate you to github. Your new deploy key should be visible on github project page. After that checkout will succeed.

Can also try the variant mentioned here.