我正在 Coursera 上学习一门 Web 应用程序开发课程，该课程要求我安装 Ruby 和 Rails。我按照以下说明操作https://class.coursera.org/webapplications-002/forum/thread?thread_id=51
当我运行该命令时sudo curl -L https://get.rvm.io | bash -s stable --ruby，收到以下错误响应：
% Total % Received % Xferd Average Speed Time Time Time Current
Dload Upload Total Spent Left Speed
100 184 100 184 0 0 988 0 --:--:-- --:--:-- --:--:-- 1383
100 20758 100 20758 0 0 35274 0 --:--:-- --:--:-- --:--:-- 35274
Downloading https://github.com/wayneeseguin/rvm/archive/stable.tar.gz
curl: (77) error setting certificate verify locations:
CAfile: /etc/pki/tls/certs/ca-bundle.crt
CApath: none
It looks like you have old certificates, you can read more about it here:
https://rvm.io/support/fixing-broken-ssl-certificates/
Downloading https://bitbucket.org/mpapis/rvm/get/stable.tar.gz
curl: (77) error setting certificate verify locations:
CAfile: /etc/pki/tls/certs/ca-bundle.crt
CApath: none
It looks like you have old certificates, you can read more about it here:
https://rvm.io/support/fixing-broken-ssl-certificates/
谷歌搜索这个错误，似乎这是 12.04 独有的。我还没有找到解决方案。有什么建议可以继续吗？从我在 Coursera 上学习入门课程这一事实可以看出，我对 Web 服务器应用程序完全陌生。
提前致谢！