终端复制 larabbs 源码的时候出错,有人知道怎么回事吗?

vagrant ssh
Welcome to Ubuntu 16.04.2 LTS (GNU/Linux 4.4.0-81-generic x86_64)

151 packages can be updated.
42 updates are security updates.

Last login: Mon Apr 9 13:39:43 2018 from 10.0.2.2
vagrant@homestead:~$ git clone git@github.com:summerblue/larabbs.git
Cloning into 'larabbs'...
The authenticity of host 'github.com (52.74.223.119)' can't be established.
RSA key fingerprint is SHA256:nThbg6kXUpJWGl7E1IGOCspRomTxdCARLviKw6E5SY8.
Are you sure you want to continue connecting (yes/no)? yes
Warning: Permanently added 'github.com,52.74.223.119' (RSA) to the list of known hosts.
Permission denied (publickey).
fatal: Could not read from remote repository.

Please make sure you have the correct access rights
and the repository exists.

《L02 从零构建论坛系统》
以构建论坛项目 LaraBBS 为线索,展开对 Laravel 框架的全面学习。应用程序架构思路贴近 Laravel 框架的设计哲学。
《G01 Go 实战入门》
从零开始带你一步步开发一个 Go 博客项目,让你在最短的时间内学会使用 Go 进行编码。项目结构很大程度上参考了 Laravel。
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