Permission denied (publickey). fatal: Could not read from remote repository. Pleasemake sure you h

执行 git submodule update --init  时出错：

正克隆到 'protobuf'... Permission denied (publickey). fatal: Could not read from remote repository.  

Pleasemake sure you have the correct access rights and the repository exists.

解决办法：

进入项目根目录：

sudo gedit .gitmodules

将对应项的git url，替换为https方式

如：将url = [e-mail]:google/protobuf 改为https://github.com/google/protobuf.git