如果您包括您的用户名和回购名称，我们可以合理地帮助您，目前我们没有理由认为回购确实存在。

此外，如果回购是私有的，并且您无法访问它，github将返回“不存在”，以避免披露私有回购的存在。

编辑:如果你不能克隆它，因为它说它不存在，它是私有的，这是因为你没有发送身份验证。确保您的公钥已添加到密匙环，或暂时使用HTTP基本身份验证。

Normally it happens because the project is private and you have not rights to write it. I had the same "problem" a few times, and it was for that reason. If the project it is yours, just create a private and a public key following this link: https://docs.github.com/en/github/authenticating-to-github/generating-a-new-ssh-key-and-adding-it-to-the-ssh-agent and add them to the "SSH and Key" section on gitHub, then you will be able to push to the repo. In the other hand if the project it is not your, ask the owner to give you the rights for it.

我也遇到过同样的问题，是私人回购。

做以下几点:

移除远端原点

git remote rm origin

重新添加原点，但与您的用户名和PWD与写权限在这个PVT回购

git remote add origin  https://USERNAME:PASSWORD@github.com/username/reponame.git

如果你属于一个组在Github检查你有写访问权。

我得到了同样的错误

ERROR: Repository not found.   
fatal: The remote end hung up unexpectedly

我在Github上创建了存储库，并在本地克隆了它。

我可以通过打开.git/config并删除[remote "origin"]部分来解决。

[remote "origin"]   
   url = git@github.com:alexagui/my_project.git  
   fetch = +refs/heads/*:refs/remotes/origin/*

然后我运行以下程序(再次)

git remote add origin git@github.com:alexagui/my_project.git  
git push -u origin master

这一次我可以推到存储库。

我也遇到过类似的问题。错误的凭据缓存在OS X的密钥链中。

查看:https://help.github.com/articles/updating-credentials-from-the-osx-keychain