Curl 错误：“raw.githubusercontent.com'；不可信

我试图使用wget通过远程服务器（ssh）从github检索一些文件，我得到的结果如下：

$ wget  https://raw.githubusercontent.com/aseemk/seadragon-ajax/master/seadragon-min.js
--2014-11-26 09:30:14--  https://raw.githubusercontent.com/aseemk/seadragon-ajax/master/seadragon-min.js
Resolving raw.githubusercontent.com (raw.githubusercontent.com)... 185.31.19.133
Connecting to raw.githubusercontent.com (raw.githubusercontent.com)|185.31.19.133|:443... connected.
ERROR: The certificate of `raw.githubusercontent.com' is not trusted.
ERROR: The certificate of `raw.githubusercontent.com' hasn't got a known issuer.

卷曲也是如此：

$ curl -o bla  https://raw.githubusercontent.com/aseemk/seadragon-ajax/master/seadragon-min.js
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
  0     0    0     0    0     0      0      0 --:--:-- --:--:-- --:--:--     0curl: (60) SSL certificate problem: unable to get local issuer certificate
More details here: http://curl.haxx.se/docs/sslcerts.html

curl performs SSL certificate verification by default, using a "bundle"
 of Certificate Authority (CA) public keys (CA certs). If the default
 bundle file isn't adequate, you can specify an alternate file
 using the --cacert option.
If this HTTPS server uses a certificate signed by a CA represented in
 the bundle, the certificate verification probably failed due to a
 problem with the certificate (it might be expired, or the name might
 not match the domain name in the URL).
If you'd like to turn off curl's verification of the certificate, use
 the -k (or --insecure) option.

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使用wget选项：

--无检查证书

似乎是一种黑客行为，我可能会缺少什么？

解决方案很简单，只需从我的debian系统安装：

$ sudo apt-get install ca-certificates

---

我在raspbian上遇到了这个问题，用以下方法解决了它：

sudo apt-get install ssl-cert

---

我的beagle bone black revc安装了debain，它说

ca证书已经是最新版本了

，错误仍然存在。如何解决这个问题您使用的是什么版本（例如：

apt缓存策略ca证书

）？最新的是：

20141019

（）同时检查系统时钟。