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.

我在更新ubuntu到下一个版本后遇到了同样的错误

我刚刚删除了我的sshkey在github帐户，然后重新添加了一个sshkey到该帐户。

都经历过同样的问题。几年来一切都很正常，然后突然出现了这个错误。

问题是，我在用户的github SSH密钥(我总是用来访问有问题的回购)之前向我的SSH代理添加了另一个回购的部署密钥。SSH代理首先尝试了另一个回购的部署键，而GitHub出于一些完全无法解释的原因说

ERROR: Repository not found.

一旦我从SSH代理中删除了部署键，一切就恢复正常了。

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.

如果你的repo之前工作正常，突然弹出这个错误，最有可能的原因是你的git被认证为其他用户，没有访问存储库的权限。因此，为了进行推送，您所需要做的就是在git命令中指定正确的用户名和密码。所以，一个github回购的推命令看起来像:

git push https://youruser:password@github.com/user/reponame.git

用户名和密码需要进行url转义，因此@应该被%40取代，等等。

eval "$(ssh-agent -s)"

这是我自己的回购——应该有足够的使用权。对于其他回购，我能够拉和推没有问题。通过重新启动ssh-agent解决了这个问题。我用macos。